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
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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.
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Explanation:
How many atoms make up a whale?
what process carried out by microorganisms in the carbon cycle releases carbon dioxide into the atmosphere
Answer: cellular respiration
Explanation:
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what is the major difference between primary and secondary succession
Explanation:
Primary succession occurs when a habitat that has completely destroyed reheals from complete scratch
On the other hand, secondary succession occurs when only a portion of the original ecosystem survives and is rebuilt from that
Which molecule allows a blade of grass to stand straight?
Answer: water molecules
Explanation: grass cells through osmosis becomes turgid making them stand
What is the function of the start codon of an mRNA sequence? A. The start codon protects the mRNA from being degraded. B. The start codon acts as a checkpoint in the eukaryotic cell cycle. C. The start codon signals for the ribosome to release the mRNA sequence. D. The start codon signals for the ribosome to begin assembling amino acids at that point in the mRNA sequence. Mark for review (Will be highlighted on the review page)
Answer:
It's D
Explanation:
The start codon signals for the risbosome to begin reassembling amino acids at the point in the mRNA
Answer:
The start codon signals for the ribosome to begin assembling amino acids at that point in the mRNA sequence.
Explanation:
A gene may be described as
Answer:
The correct answer for the fill in the blank is - A sequence of bases on the DNA that codes for a trait.
Gene is described as a segment of DNA ( deoxyribonucleic acid) that codes for a particular protein, which in turn corresponds to a trait/ characteristic of the living organism.
Gene is first transcribed into mRNA ( messenger RNA) through a process called transcription. mRNA is then converted into protein through a process called translation.
The protein thus formed corresponds to a particular trait ( like eye color, hair color).
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What does semi-permeable mean in a relation to cell membranes?
Answer:
Cell membrane is also called as semi permeable membrane.
Explanation:
It allows some chemical compounds to pass through and stops the other from their entry.
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1.) crust
2.) mantle
3.) outer core
4.) inner core
a.) a solid layer made up of part continental and part oceanic
b.) a solid layer of iron and nickel inside Earth
c.) the only liquid layer of Earth
d.) a nearly melted layer right under the Earth's surface.
Answer:
outer core
Explanation:
the only liquid layer of earth
Answer:
see below
Explanation:
1.) crust → a.) a solid layer made up of part continental and part oceanic
2.) mantle → d.) a nearly melted layer right under the Earth's surface.
3.) outer core → c.) the only liquid layer of Earth
4.) inner core → b.) a solid layer of iron and nickel inside Earth
This part of the nervous system regulates involuntary actions such as
heart function, blood pressure, breathing, digestion.
The autonomic nervous system (ANS) is in charge of controlling involuntary processes such as digestion, respiration, blood pressure, and heartbeat. The sympathetic and parasympathetic nervous systems make up its two divisions.
Through the "fight or flight" response, the sympathetic nervous system prepares the body for emergency situations. It speeds up the heartbeat, constricts blood vessels, widens the airways and releases stress hormones. These responses improve physical ability and preparedness for potential threats.
In contrast, the parasympathetic nervous system encourages relaxation and energy conservation through the "rest and digest" response. It promotes digestion, lowers heart rate, and promotes restorative and recovery processes.
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When do light independent reactions occur
Answer:
Light-independent reactions are carried out in three steps, termed Calvin cycle collectively: carbon fixation, reduction reactions and 1,5-bisphosphate (RuBP) ribulosis. Even if the "dark" reactions are called, the Calvin cycle actually does not occur in the dark or at night.
Explanation:
Answer is above
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Answer:
Light-independent reactions take place in plant chloroplasts. In this process, sugars are made from carbon dioxide.
Explanation:
1. During a solar eclipse, what blocks all, or some of the sun's rays from reaching the Earth?
O New moon
the Sun
the Earth
Mars
Answer:
New moon
Explanation:
During a solar eclipse it is the moon that blocks light from the sun. If you are standing at the right time at the right place on the earth looking at the sun during a solar eclipse, you can actually see it happening.
This is a rare fenomenom, and you should defenately try to experience it, whenever you get the chance.
What step would likely be affected if the bacteria are exposed to this antibiotic
Answer:
bacteria subjected to an antibiotics will have their ribosomes inhibited whixh will stop them from synthezing proteins which stops the possibility of reproduction and many other vital functions.
Which term describes the chromosomal abnormality of having three copies of a single chromosome? haploidy diploidy trisomy tetrasomy
Answer:
trisomy
Explanation:
The prefix tri- means three
The prefix di-means two
The prefix tetra- means four
Answer:
The answer is Trisomy.
Explanation:
The word "Tri-" means having three times the single amount of something.
Habitat destruction is very often the result of
Answer:
Habitat destruction (land use) that results from the expansion of human population. ... Threats to habitat in decreasing order of importance. Agriculture (38%), commercial devlop., water projects, outdoor rec., livestock grazing, pollution, infrastructure/roads, disruption of fire, and logging (12%)
Explanation:
Answer:
Logging,Over fishing,Hunting,and clearing areas
Explanation:
The activity of human is the primary cause e.g logging and hunting
1. What is venation ?
2. What are autotrophe ?
3. What does plant require to cook food for itself ?
Please help me asap !!
Answer:
1. Arrangement of veins in a lamina is called venation.
2. All green plants have the capability to prepare their own food and are called autotrophe .
3. Plants Require :
WaterCarbon DioxideChlorophyllEnergy( From Sunlight)Explanation:
Hope it helps out !!Based on the diagram above, which organism will have the greatest physical difference from its ancestor?
a) birds (b) lobsters (c) perch (d) mammals
What is the role of the MCR1 gene in determining a populations fitness for survival
how can you prevent transmission of cholera from a patient to a healthy person?
Description:
To prevent transmission of cholera from a patient to a healthy person you should use safe water meaning clean water. Wash your hands with clean water with soap. Also cook food well mostly see food including fish
Answer:
Use safe water
Wash your hands with soap and clean water
Cook well mostly see food including fish
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what are the different types of natural selection
Answer:
Types of Natural Selection:
Directional selection
Stabilizing selection
Disruptive or Diversifying selection
Kin selection
Sexual selection
Explanation:
which part of the body contains enzymes that break down starch into sugar
Answer:
In the human body, amylase is predominantly produced by the salivary glands and the pancreas. Although salivary and pancreatic amylases are similar, they are encoded by different genes (AMY1 and AMY2, respectively) and show different levels of activity against starches of various origins [10].
Explanation:
Why are food regations important
They are important because so people do not get sickness
Answer:
The general purposes of U.S. food law are to minimize the risk of unsafe food (it is too costly to assure that food is safe).
Explanation:
Food safety standards and regulations are essential to ensure food is safe at all points along supply chains in both international trade and within nations.
what type of unit is unit of speed?
Answer:
the correct answer is The SI unit of speed is metre per second, but the most common unit of speed in everyday usage is kilometre per hour or, in the US and the UK, miles per hour.
Explanation:
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Answer: the and is M/S
Explanation:
Hemophilia is a disease that causes uncontrollable bleeding. If a father has it, all of his daughters will be carriers of the disease, and about half of his sons will have the disease. Which macromolecule is involved in how hemophilia is passed from parents to their children? carbohydrate lipid nucleic acid protein
Answer:
nucleic acids
Explanation:
Nucleic acid is involved in how hemophilia is passed from parents to their children.
What is nucliec acid?
Nucleic acids are large biomolecules that play essential roles in all cells and viruses. Nucleic acids are the main information-carrying molecules of the cell, and, by directing the process of protein synthesis, they determine the inherited characteristics of every living thing.
A major function of nucleic acids involves the storage and expression of genomic information. Deoxyribonucleic acid, or DNA, encodes the information cells need to make proteins.
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Which statement describes renewable resources?
Answer:
What are our options? What are the possible answers?
for each of the following organisms, describe how digested food reaches their body cells: a hibiscus plant, a paramesium, a coral polyp, an earthworm, a mosquito a human
Answer:
Hibiscus plant: transported by the phloem
Paramecium: simple diffusion from the food vacuole into the cytoplasm
Coral polyp: diffusion from the gut to the body cells
Earthworm: transport through the blood
Mosquito: transport through the blood
Humans: transport through the blood
Explanation:
Digestion involves both mechanical and chemical processes to break up
food into smaller or simpler constituent parts that can be absorbed by the body.
Digestion is divided into external digestion and internal digestion.
External digestion involves digestion of food outside the body using digestion enzymes and then absorption into the body by diffusion.
Internal digestion is when food is ingested into the body, broken down by Digestive enzymes and juices and then absorbed into the body cells.
A hibiscus plant stores it's food as starch. When the stored food is needed, it hydrolyses starch into molecules small enough to pass through the cell membrane. The hydrolysed food molecules are then transported by the phloem to cells that need them for energy production.
A paramecium is a protist which feeds by endocytosis, i.e. sorrounding and digesting food in its food vacuole. The digested food diffuses through the cell
cytoplasm and mitochondria oxidise it to produce ATP.
A coral polyp is a marine invertebrate belonging to the phylum Cnidaria.
Cnidarians have a simple sac-like gut, with only one opening and one unspecialised gut chamber.
They do not have a circulatory system to deliver nutrients to the cells, instead digested food diffuses from the gut to the body cells.
An earthworm is an annelid and carries out internal digestion. Food taken in from the mouth is digested and absorbed by the intestines into the blood. The blood then carries the absorbed food to the earthworm’s body cells.
Mosquitoes both male and female feed on sap and nectar, aphid honeydew, and plant juices, but in many species the mouthparts of the females are adapted for feeding on the blood of other organisms.
Food taken in by the mosquito is digested in the mid-gut by digestive enzymes. The blood absorbs digested food from the mid- gut and carries it to its body cells.
In Humans, digested food molecules are absorbed in the small intestine into our bloodstream. The blood then carried digested food molecules around the body to the cells where they are needed.
What evidence indicates that there is a competition taking place among the plants in a natural setting?
Answer: 1. Ability of some plants to grow taller than Thier counterparts for sunlight.
2. The ability to release toxic substances to avoid competition from other plants
3. The ability of the plant to extend its roots for water and nutrients.
Explanation: A natural setting occurs in the forest where plants depends on sunlight and nutrients and water from the soil for survival and growth without the interference of man.
Because of these, there would be competition as the resources are limited enabling only the stronger to survive and grow and such evidences can be seen in
1. Some plants grow rapidly and become taller, other have broad leaves than other plants in the competition for sunlight at the expense of other plants eg redwoods trees or oak trees.
2. Some plants have the ability to extend Thier roots as far as possible to get water and nutrients to ensure Thier survival and growth.
3. Some plants release toxins to the environmental to prevent other plants from existing close to them to compete with them. Eg sunflower.
Why insects are the most diverse animals that live in all habitats?
You used blank to inderiectly find the blank of the objects
Answer:
Explanation:
Ur question is not completed..
??
Since all living things on Earth share the same universal code in DNA and RNA molecules, which of the following is most likely true ?
Answer:
where are the answers?