Answer:look at pic
Explanation:
When there is high selective pressure is the major factor in evolution.
What is Genetic drift?Genetic drift is the arbitrary change in the population's frequency of a gene variant that already exists. Gene variations may totally vanish due to genetic drift, which would limit genetic diversity. Moreover, it can make previously uncommon alleles far more common and even fixed.
Genetic drift is an evolutionary process in which the frequency of a given gene allele varies randomly across a population.
The impacts of genetic drift can be severe, often causing traits to become excessively common or to vanish from a community, even though it predominantly affects small, isolated populations.
Therefore, When there is high selective pressure is the major factor in evolution.
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A closed system is best characterized as a system in which: (3 points)
Answer:
A closed system is a physical system that does not allow transfer of matter in or out of the system, though, in different contexts, such as physics, chemistry or engineering, the transfer of energy is or is not allowed.
This type of sexual reproduction is when sperm and egg join together externally (outside of the body). *
Answer:
External Fertilization
Explanation:
Please mark brainliest
Which characteristic helps grasses survive dry conditions?
long, flexible stems
long, skinny leaves
small, soft flowers
deep roots
answer: deep roots. hop u do good on ur test guys
In the picture below, a ray of light hits a surface and changes direction. What is this action called?
ray of light
A.transmission
B.incidence
C.reflection
D. refraction
Answer:
reflection
Explanation:
1.What is the function of melanin in the epidermis?
a. To provide support for blood vessels
b.To waterproof and protect the skin surface
c.To protect tissues from ultraviolet radiations
d. To stimulate the growth of hairs in the follicles
2.Which actions takes place in the stomach?
a.Protein is broken down
b. Amylase breaks down starches into sugar molecules
c. Large fat molecules are digestive into smaller fat molecules
d.Nutrients are absorbed and distributed to different body cells
3.Which structure moves down as its muscles contract?
a. Diaphragm
b.Pharynx
c.Ribs
d. Trachea
4.What do we call the muscles that we can control?
a.Voluntary
b.Cardiac
c.Smooth
d.Involuntary
5.Which of the following protect the lungs?
a.Clavicle
b.Ribs
c.Scapula
d. Sternum
6.It is the largest organ in our body.
a.Intestine
b.Pelvic bone
c.Skin
d.Eyes
7.How does air enter your body?
a.Trough the digestive tract
b.Trough the respiratory tract
c. Trough the pores of the skin
d.Trough the ear canal
8.Which of these is NOT a part of the digestive system?
a. Kidneys
b.Mouth
c.Stomach
d. Esophagus
sana po sagutin niyo ng maayos
Answer:
1.c
2.c
3.a
4.a
5.b
6.c
7.b
8.a
Explanation:
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McCabe and castle conducted experiments to assess whether a brain image influenced the way students perceived the quality of a scientific article. When other experiments attempted to replicate the results they found
Answer:
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According to the Janzen-Connell hypothesis, in order for pathogens or herbivores to contribute to the maintenance of diversity: Select all that apply. the pathogens/herbivores must be host-specific. mortality of seedlings due to competition between plants must be less important than mortality due to herbivores/pathogens. the infections must be avirulent. the pathogens/herbivores must result in lower seedling mortality close to adult plants of the same species.
Answer:
The correct answer is -
The pathogens/herbivores must be host-specific.
Mortality of seedlings due to competition between plants must be less important than mortality due to herbivores/pathogens.
Explanation:
According to the Janzen-Connell hypothesis, it is showed by research that seeds of rare species are more likely to escape seed from herbivores/pathogens. According to this theory, pathogens should be able to infect only a specific species.
Competition is less important in terms of mortality of seeds than it is due to the predators such as herbivores/pathogens of a species according to this hypothesis.
please help me!!!!!!!
While their unique evolutionary paths have led to different adaptations, non-vascular and vascular plants are commonly found occupying similar habitats and together play an important role in establishing community structure and biodiversity. Compare and contrast how they interact together in this particular ecosystem, and the role their unique adaptations have played in forming the above relationships (Compare and contrast at least 2 relationships). What happens to these interactionsifwe lose just one species
Answer:
Non-vascular plants provide nutrients, avoid erosion and habitat to animals.
Explanation:
Non-vascular plants has played an important role in the ecosystem and biodiversity because it releases various nutrients in the soil which can be used by the vascular plants from the soil and also reduce erosion of the soil. These non-vascular plants provides habitat and food to various animals in the ecosystem. If the non-vascular plants can be removed from the ecosystem, the whole ecosystem will be disturbed and adverse effect on vascular plants and animals occur.
Describe at least two ways in which the large horns on the sheep shown here could reduce their fitness.
Answer: one way that the large horns can reduce their fitness is by fighting another sheep. Another way they can reduce their fitness is their energy.
Two ways in which the large horns on the sheep shown here could reduce their fitness.
1. The large horns can reduce their fitness is by fighting,
2. They can reduce their fitness is their energy.
What is the use of sheep horns?
Horns serve as weapons of defence against predators and of offence in battles between males for breeding access to females. Horns are hardened corneal projections of several types.
Hence, The large horns can reduce their fitness is by fighting, and they can reduce their fitness is their energy.
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HELP!
Which types of organisms can be multicellular or unicellular?
Producers
Consumers
All of the above
None of the above
HELP PLS, AND EXPLAIN, I BEG: Nancy needs to do a scientific investigation for her class. She is interested in pottery, plants, and basketball. Which of the following questions would be suitable for use in a scientific investigation?
A. What length of time is best to use for the firing of pottery to make it strong?
B. How many needles grow on the giant redwoods in California?
C. What color of carnation flowers do people find most attractive?
D. What is the most number of points ever scored in a professional basketball game?
Answer:
A. What length of time is best to use for the firing of pottery to make it strong?
Explanation:
Point A
What length of time is best to use for the firing of pottery to make it strong?
This is a scientific question for Nancy since while making pots from black mud, it is very important to know how much time is required to fire the pot in order to make it strong. Because if we fire it for too long the pot may be become too hot and will eventually crack. While if we fire for less time it will not become hard enough to withstand its shape. So knowing the proper time to fire the pot is very essential in pottery.
Point B, Point C and Point D are not scientific investigations since it includes ones likes and dislikes, quantities and numbers of goal scored which is not scientific.
Hence, option A is the correct answer.
After resting for 10 minutes, you decide to perform another explosive, one-time movement such as a standing vertical jump and again, exert maximal effort. You briskly push yourself up from a chair and walk about 1.5 minutes to arrive at a wall where a vertical jump measurement can be made.
a. anaerobic metabolism
b. lactic acid metabolism
c. aerobic metabolism
Answer:
The correct answer is a. anaerobic metabolism.
Explanation:
Anaerobic metabolism refers to a high intensity of exercise in which the absence of oxygen limits performance due to the accumulation of metabolites and the corresponding metabolic and physiological dysregulation.Predominantly anaerobic exercises are characterized by: high intensity and short duration, energy is obtained from immediate sources such as muscle ATP, phosphocreatine (PC) and glucose and does not need oxygen for this. For very explosive or high intensity movements it is necessary to obtain a powerful and fast energy, this is obtained by anaerobic systems. The anaerobic metabolism is able to respond immediately to the energy demands of physical exercise and can provide energy for very high intensity exercises (strength and / or power). But this system has a limited capacity, it is short-lived, so if the exercise continues, either you have to stop due to fatigue or reduce its intensity (the power developed) to a level where energy can be obtained through the aerobic metabolism.
why is it important to know what is DNA is?
Methods used to study mineral elements present in plants
Answer:
The quantitative concentration of mineral elements present in horticultural crops can be determined by atomic absorption spectrometry (AAS), inductively coupled plasma atomic emission spectrometry (ICP-AES), inductively coupled plasma mass spectrometry (ICP-MS), flame atomic absorption spectrometry (FAAS)
Sedimentary rock indicates the current or past existence of__ A. Water B. plants and animals C. carbon dioxide D. lava
Answer:
The answer is A. Water
Explanation:
some one reported my answer for incomplete even tho it was complete
The temperature at which air becomes saturated with water vapor is called the _____.
Answer:
dew point
Explanation:
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Tortoiseshell cats have an extra sex chromosome which causes their mottled fur colors; the different colors are a result of different X chromosomes being activated in random cells. This is called:
a. x-inactivation
b. x-expression
c. x-activation (not this, I know because I submitted and it's not this)
d. y-inactivation
Answer:
A. X-inactivation
plsss help me
Thank you
pls, help 100 points whoever answers gets brainiest!
Which scenario describes a relationship of parasitism?
A . A tapeworm latches itself in the intestines of a rat, feeding off all the nutrients eaten by the rat.
B. Oxpecker birds eat parasitic ticks off the backs of zebras.
C . Birds feed off the insects that are stirred up from the grasses as cattle move through.
D.A polar bear catches a seal for dinner.
Answer:A . A tapeworm latches itself in the intestines of a rat, feeding off all the nutrients eaten by the rat.
Explanation:
Answer:
a
Explanation:
paratism is the practice of living as a parasite in or on another organism and a tapeworm is a parasite living in the rat so it is a
In humans, freckles are a trait that exhibits simple dominance. The two alleles for this trait are freckles (A) and no freckles (a). A freckled man whose mother has no freckles marries a woman with no freckles. What is the probability that their first child will have freckles? Use the Punnett square to show your work.
Answer:
50 percent
Explanation:
Aa goes with aa
so their children's genotypes would be
Aa Aa aa and aa
so two with freckles and two without freckles which is why their first child has a 505 chance of having freckles
hope this helps :)
The probability of having a freckled child is 50%. because half of the children will have the genotype Aa, which is freckled, and half will have the genotype aa, which is no freckles.
What is a punnett square?A Punnett square is a tool used to predict the probability of an offspring having a particular genotype (genetic makeup) based on the genotypes of its parents. To create a Punnett square, we use the alleles of the parents and place them into a grid, with one allele from one parent on the top and the other allele from the other parent on the left-hand side.
In this scenario, the father has a genotype of Aa (freckled) and the mother has a genotype of aa (no freckles). The mother only has the recessive allele (a) and the father has both dominant (A) and recessive (a) allele.
The probability of having a freckled child is 50%. because half of the children will have the genotype Aa, which is freckled, and half will have the genotype aa, which is no freckles. The dominant A allele will mask the recessive a allele and make the offspring freckled.
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What affect does the Sahel's climate and physical characteristics have on population distribution?
Answer:
The Sahel has been labeled as one of those regions with the danger of overpopulation. It has been described with adjectives such as semi-arid, hot, dry, windy or sunny.
Sources have it that the G5 Sahel countries which include Mali, Niger, Burkina Faso, Mauritania, Chad will increase from about 84 million inhabitants in 2019 to 197 million in 2050. This projection includes people under 15 years of age which comprise about 50% of the entire population.
The climate itself doesn't seem to deter population growth. What seems to be occurring is sedentarization. This is due to rapid desertification and drought which have persisted for some time.
Explanation:
Sedentarization refers to the choice of a group of people who usually are very nomadic or migratory to settle permanently in a place.
This is usually due to a more favorable weather and topography which supports agriculture.
Cheers!
Is tetracycline selectively toxic?
Identify the changes as either chemical (C) or physical (P). If chemical, what is the evidence?
Burning a piece of paper
Tearing a piece of paper
Digesting food
Heating a cup of water
Mixing baking soda and vinegar
Mixing calcium chloride and water
Answer:
1). P
2 C
3 P
4 P
5. P
Explanation:
THSE Answer are right a
Explain what Dawkins means when discussing local rules on the cellular level (both in terms of tissue development and of their internal chemistry).
Answer:
The development of the embryo is what Dawkins means that is performed by the local rules on the cellular level in terms of internal chemistry and tissue development. A small and local unit present in the human body that follows the rules of the on the particular scale.
Dawkins explains that development that various tissues develop and controls other cellular responses during the development of the embryo is in progress. He also suggested that differentiation of the cells is asymmetric cell division.
is the above cell a plant cell or animal cell? provide two observable
Explanation:
you have not showed the cell..please
What is Biodiversity's value?
Answer: The value of it is important because we are so dependent on it
Explanation: It has a value of ecosystem characteristics are ussualy associated into cultural traditions
In a manufacturing assembly line, products get larger and more complete as they pass along. Briefly explain how this compares to your digestive system.
Answer:
Our digestive system does the opposite of an assembly line. Instead of getting complex and bigger, they are broken down into smaller pieces by mechanical and chemical processes in our digestive tract.
Explanation:
Food is first broken down mechanically in our mouths. Then chemicals in the stomach digest the food further. There also is mechanical digestion in this section of the digestive tract. As the food descends, more nutrients are absorbed in the intestines, in this areas the contraction of the muscles helps to move the processed food up to the end of the "assembly line" where the product is less complex than it used to be since the nutrients are now in our body.
Please help///6. What is the genotype of a color-blind male with long fingers, if s = long fingers? If all of the children have normal vision and short fingers (S = short fingers), what is the likely genotype of the mother?
Answer:
WwSs WwSs
Explanation:
there's a quizlet I found it on!
Two parents with widow's peak and short fingers have a child with a continuous hairline and long fingers. What are the genotypes of the two parents? (W = widow's peak; S = short fingers)
WwSs WwSs