Answer:
Homo erectus. it first spread through africa and eurasia.
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Explanation:
Answer:upright man
Explanation:Upright man
Homo erectus
Homo erectus appeared about 2 million years ago and, in several early migrations, it spread throughout Africa (where it is dubbed Homo ergaster) and Eurasia. It was likely the first human species to live in a hunter-gatherer society and to control fire
Which describes a feature of the physical properties of all substances? A) Can dissolve in water. B) Can conduct heat and electricity. C) Rearranges atoms to form new substances. D) Does not change the identity of a substance.
Answer: D
Explanation:
The features that give description of the physical properties of substances as regards this question is Does not change the identity of a substance.
physical property of a substance can be regarded as those features The features that give description of the physical properties of substances as regards this question is Does not change the identity of a substance.physical property of a substance can be regarded as those features as well as characteristic of that substance which can undergo observation as well as measurement and after measurement the substance will still retains it's identity.This implies identify doesn't change. Physical properties of a substance can include properties such as ;
color
density
boiling points
hardness
melting.
Therefore, option D is the right answer.
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An adult organism produces gametes that quickley go through fertilization and form diploid zygotes.The zygotes mature into adults, which lives for many years.Eventually the adults produce gametes and the cycle repeats. What type of life cycle does this organism have?
Answer:
life
Explanation:
Which statement best relates why these animals have so much blubber?
Answer:
awnser mine and ill awnser urs
Explanation:
Why is understanding mitts important?( Select the best answer)
1.It helps us understand how organisms repair.
2. It helps us understand how organisms grow.
3. It is important for cancer research.
4. All options correct.
Which of the following best describes the structural relationship between genes, chromosomes and DNA?
A.Genes consists of two long strands of chromosomes, and each of these two strands consists of molecules called DNA.
B.Each DNA molecule consists of a number of pairs of genes, and each pair of genes on the DNA molecule is made up of chromosomes.
C.Each chromosome consists of number of DNA molecules, and each DNA molecule is made up of one to four different genes.
D.Each chromosome consists of a single long DNA molecule, and each gene on the chromosome is a particular segment of that DNA.
Answer:
D.Each chromosome consists of a single long DNA molecule, and each gene on the chromosome is a particular segment of that DNA.
Explanation:
A closed DNA molecule contains two strands of linear nucleotide sequences, and both DNA strands contain genes. These genes are DNA sequences that may be transcribed in messenger RNAs (mRNAs).
The cell nucleus contains chromosomes in which the double-stranded DNA molecules are packaged by specialized proteins (histones). Moreover, there are organelles (mitochondria and chloroplast) that also contain genes which are transcribed in an analog mode to genes contained in the nuclear chromosomes.
The correct statement is "Each chromosome consists of a single long DNA molecule, and each gene on the chromosome is a particular segment of that DNA"
Chromosomes are condensed strands or rings of DNA and have a double structure, composed of chromatids, in these the genes are located, in the same position with respect to their homologous.
Genes are found within chromosomes (which in turn make life in the nucleus of our cells).Each gene occupies a specific position, called a locus, along the gigantic chain of sequences that makes up DNA.Therefore, we can conclude that chromosomes are structures composed of DNA and genes are short segments of DNA, which is found within the chromosome always located in the same place.
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Students recorded their heart rates in several situations. Which of the following data collected would illustrate a feedback response?
A)All students had a constant heart rate while they were at rest.
B)All of the student's heart rates are within a certain range.
C)The heart rates of males were higher on average than females.
D)Every student had an elevated heart rate during exercise.
Answer: Option D.
D)Every student had an elevated heart rate during exercise.
Explanation:
The students have elevated heart rates during exercise. This is because during exercise, muscles need 3 times or four times oxygen when you exert yourself. During exercise, the heart beat faster which make for quicker pulse so that more blood is pump out of you body. The heart beat both stronger and faster to increase cardiac output during exercise.
Cardiac output is stroke volume × heart rate.
Stroke volume is the amount of blood pumped by the heart.when the heart beats.
Heart rate is the number of times heart beats per minutes.
How does abnormal development take place in man?
Answer:
lol that's a hard question idk
Abnormal development is present when development of a person occurs in an unexpected way and exhibits an unusual pattern of behavior, emotion, or thought. It can occur at any stage of development. Symptoms of abnormal development include a disturbance in behavior, thought, or emotion.
Like the atmosphere, the
transports and distributes heat on Earth, helping to regulate climate.
-Ocean
-mountains
-beaches
Answer:
Ocean
Explanation:
Like the atmosphere, the ocean transports and distributes heat on Earth, helping to regulate climate.
The sea is divided geographically into various areas such that each of the area is known as ocean.
Mountains alter wind flow besides creating a rain shadow effect.
Beaches protect people from the high winds and waves of powerful storms.
Which of the following are examples of
geographic barriers? Choose two.
Body of water
small stream
Mountain
dirt road
ouTube
Answer: Mountain, small stream
Explanation:
Sheela wants to make a computer model of a land ecosystem. Part of her model simulates the chemical processes of photosynthesis that involve the creation of sugars. Which chemical processes are these?
Answer:
The options to this question are missing, the options are:
A. the light-dependent reactions
B. the light-independent reactions
C. the dark reactions
D. the reactions in the mitochondria
The answer is A
Explanation:
Photosynthesis is a unique phenomenon carried out by cells of autotrophic organisms. Photosynthesis, which generally involves the synthesis of food in form of sugar, occurs in two distinct stages viz: light-dependent and light-independent stages.
These two processes are important to the overall result of the photosynthetic process. However, the light-dependent stage (needs light to occur) produces the energy needed for the synthesis of sugars. The light-dependent stage which takes place in the thylakoid membrane of the CHLOROPLAST synthesizes the NADPH and ATP molecules, which enters the light-independent reactions to be used to power (ATP) and provide electrons (NADPH) needed for the purpose of creating sugar (glucose).
Hence, the part of Sheela's model that is simulating the chemical processes of photosynthesis are the light-dependent reactions.
Answer:
the light-independent reactions
Explanation:
i took the e2020 quiz and it said the B was the correct answer
The atmosphere is full of nitrogen gas (N2). But plants cannot use nitrogen in this form. Summarize the roles of bacteria in making nitrogen available to plants and in returning nitrogen to the atmosphere.
Answer:
Explanation:
Since plants cannot make use of nitrogen in this form, they need the help of some organisms which are Bacteria; nitrifying bacteria etc o help in the conversion of this form of nitrogen to that particular form mostly nitrates they can utilize directly.
Thus, most nitrogen is collected from the atmosphere and fixed by microorganisms such as bacteria to form ammonia, nitrites, and nitrates that can be used by plants. These organisms make use of the enzyme nitrogenase to aid in the conversion of atmospheric nitrogen (N2) to ammonia (NH3).
Nitrogen is returned to the atmosphere by denitrification which is the opposite if nitrification and is carried out by denitrifying bacteria. Nitrate is reduced to nitrogen through the production of some intermediate products.
answer what he said
explanation
What is an stimulus? Define it and give two examples of stimuli for a living being.
Answer:
stimulas is something that causes a reaction exictement or energy e:g it is a shiny object for a baby
A lion has sharp pointed teeth while a buffalo has flat, broad teeth. Why do you think the teeth in these animals differ?
Answer:
Explanation:A carnivor will have sharp pointed teeth because a lion eats meat and needs to rip it apart whereas a buffalo eats leaves and plants (herbivores)so they have flat teeth as leaves are easier to bite and chew than meat.
Answer:
A lion feeds on flesh while a buffalo feeds on grass.
Explanation:
Why are zebra mussels a problem in the Great Lakes but not in the lakes systems where they came from?
Answer:
B. They have natural predators in the other lakes.
Explanation:
I'm pretty sure that's it, because if it's the lakes they originally came from, then they'd have predators to even their population out.
As Darwin was developing his ideas about evoution, he applied ideas from many fields, including geology, economics, and biology. Why was this approach important?
Answer:
Explanation:
Darwin's use of many different fields of study including geology, economics, and biology was incredibly important as it allowed him to make connections between them that ultimately led to ground breaking discovery. Such as animals that that migrated to different areas and were interconnected through their geological footprints that were left behind.
Answer:
Darwin's theory of natural selection is important because it enables us to understand the forces driving evolution in living organisms. This evolutionary mechanism may also be used in different research fields ranging from molecular biology to economy.
The evolution theory states that the organisms that are better adapted to the environment have more chances to survive and to reproduce, thereby perpetuating their own genes in future generations. This idea of selection can also be applied to other disciplines. For example, in the economics field, it has been proposed that Darwin's theory may explain why those traits related to morality (such as fairness, honesty and integrity) which are beneficial for one particular group but not for the individual are not selected in real life.
Explanation:
Genetic engineering involves to achieve desired results.
a. enzyme production
b. modifying products and processes
C changing one organism into another
d introducing traits into organisms
Please select the best answer from the choices provided
Ο Α
B
D
Answer:
The answer is option D
Hope this helps.
The answer is D.Introducing traits into organisms
I did the test and I got it correct :)
The root word terra means “land” or “territory.” Terrestrial planets are the planets closest to the Sun. Why are they are called terrestrial planets? Make your best guess.
Answer:
The planets Mercury, Venus, Earth, and Mars, are called terrestrial because they have a compact, rocky surface like Earth's terra firma.
Explanation:
A terrestrial planet, telluric planet, or rocky planet is a planet that is composed primarily of silicate rocks or metals. Within the Solar System, the terrestrial planets are the inner planets closest to the Sun, i.e. Mercury, Venus, Earth, and Mars
The planets Mercury, Venus, Earth, and Mars, are called terrestrial because they have a compact, rocky surface like Earth's terra firma.
Brown lizard that has invaded some areas of Florida
please write a clear and appropriate question
Answer:
Brown Anole
Explanation:
Hope it helps.
A response is a _______________ to a stimulus. • A stimulus is anything that can cause an individual to respond or react. • Stimuli can be _________ or ____________ .
Answer:
A response is a _reaction to a stimulus. • A stimulus is anything that can cause an individual to respond or react. • Stimuli can be _internal or external.
Explanation:
A change in the cellular make up of an organisms due to response or reaction to a stimulus is called a response. This response can be due to a stimulus inside the body , or due to effect of an external ( stimulus) object on the body-stepping on a sharp pin.
In either cases, the stimulus is receive by the receptors, which transfer the stimulus through the sensory neuron to the inter neuron in the CNS, for the motor neuron to bring an effective response at the effectors.
During DNA replication, GCAT becomes GCTTA. This is an example of _____. deletion
insertion
substitution
copying
Answer:
Insertion and Substitution
Explanation:
During DNA replication, an Insertion is defined as an addition of one or more nucleotide to the DNA strand, during replication process. An obvious example is the process of insertion in microsatellite regions due to the DNA polymerase slipping.
While Substitution in DNA replication process is a term that describes the changing or substition or swapping of one or more nucleotide for another during DNA replication.
For example a change in a single "chemical letter" such as switching an A to a G, is a good example of substitution.
Hence, in this case, both Insertion and Substitution occured as GCAT got additional T chemical letter or nucleotide and which is described as Insertion.
While, there is also a change in position of C and A nucleotides, thereby forming GCTTA, which is termed as Substitution.
I believe its just insertation because another gene or whatever was inserted. haha ik it doesnt really make sense but i think its right
Which statements correctly describe the digestive system? Select four options.
Food is cut into pieces in the mouth.
Food becomes dry in the mouth.
Proteins are broken down in the stomach.
Carbohydrates are first broken down in the stomach.
Food becomes mostly solid in the large intestine.
Fat is broken down into smaller droplets in the small intestine.What is peristalsis and where does it occur?
Answer:
1,3,5,6
Explanation:
Why should pets be allowed in school??
Answer:
Pets help students with emotional support on stressful things.
Explanation:
Hope this helps
The definition of theory says that it is a hypothesis or group of hypotheses. In your own words, explain why a theory is also a hypothesis, using the definitions as a starting point. In your answer, provide an example of a theory that is a hypothesis supported by repeated experimentation.
Answer:
An in-depth illustration of a natural process that takes place in nature is termed as a scientific theory. After performing a scientific method the formation of a theory takes place. The generation of a good scientific theory takes place after proving, testing, and linking different kinds of ideas that are not just assumptions.
A theory can also be considered as a well-illustrated hypothesis as a scientific theory is a deeply illustrated and a well-substantiated idea that overpowers the restricted illustration of a suggested hypothesis. A theory is an amalgamation of various ideas.
The theory of relativity, which was postulated by Einstein in 1915 is a good illustration of a scientific theory that has been repeated several times. After the emergence in 1915, the theory was again examined in 1919 during the solar eclipse and was afterward examined and tested by different other scientists.
Answer:
uranium-lead (U-Pb) dating
relative chronology
expected effect of additional similar results on mass-extinction hypothesis
connection between the use of new technology and a possible revision in the mass-extinction hypothesis
identification of the use of the new technology as a new experimental method
Explanation:
Help please
Global warming is caused by an increase in the level of carbon dioxide gas in the atmosphere. How has this affected the world's oceans?
A) There is an overgrowth of algae.
B) The oceans are warming as a result of the excess carbon dioxide.
C) The oceans are absorbing the excess carbon, causing the oceans to become acidic.
D) The oceans reflect a great deal of the carbon dioxide gas back into the atmosphere.
Which of the following is not a natural factor that influences the differential survival of organisms?
how many does carbohydioxide get into a leaf
Answer:
The carbon dioxide enters the leaves of the plant through small pores called stomata
Explanation:
Answer:through the stomata
Explanation:
Leaves on the bottom part have "pores" through which carbon iv oxide enters
Which is a role of photosystem II in the light reactions?
A. Making NADPH
B. Splitting H20
C. Making ADP
D. Making NADP+
Answer: B. splitting h20
Explanation:cause i said so
describe the benefits and risks of chemotheraphy
How far back are ancestors ?
Answer:
The Last Universal Common Ancestor (LUCA) is the most recent common ancestor of all current life on Earth, estimated to have lived some 3.5 to 3.8 billion years ago
pls mark brainliest
Explanation:
Answer:
An ancestor, also known as a forefather, fore-elder or a forebear,[1] is a parent or (recursively) the parent of an antecedent (i.e., a grandparent, great-grandparent, great-great-grandparent and so forth). Ancestor is "any person from whom one is descended. In law the person from whom an estate has been inherited."[2]
Two individuals have a genetic relationship if one is the ancestor of the other or if they share a common ancestor. In evolutionary theory, species which share an evolutionary ancestor are said to be of common descent. However, this concept of ancestry does not apply to some bacteria and other organisms capable of horizontal gene transfer. Some research suggests that the average person has twice as many female ancestors as male ancestors. This might have been due to the past prevalence of polygynous relations and female hypergamy.[3]
Assuming that all of an individual's ancestors are otherwise unrelated to each other, that individual has 2n ancestors in the nth generation before him and a total of 2g+1 − 2 ancestors in the g generations before him. In practice, however, it is clear that most ancestors of humans (and any other species) are multiply related (see pedigree collapse). Consider n = 40: the human species is more than 40 generations old, yet the number 240, approximately 1012 or one trillion, dwarfs the number of humans who have ever lived.
Some cultures confer reverence to ancestors, both living and dead; in contrast, some more youth-oriented cultural contexts display less veneration of elders. In other cultural contexts, some people seek providence from their deceased ancestors; this practice is sometimes known as ancestor worship or, more accurately, ancestor veneration.
hope helps
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Explanation:
Bases form _____ ions, while acids form _____ ions.
hydroxide; hydrogen
sodium; hydroxide
hydrogen; hydroxide
hydronium; sodium
Answer:
bases form hydroxyl ions while acids form hydrogen ions