Answer: Evolution is the process by which populations of organisms change over generations. Genetic variations underlie these changes. as we evolve our genetic genes change because the gametes come from 2 parents and has half the DNA (23) and thousands of years passes and if you will compare people in ancient times to now we are completely different.
B. a desert in southern Texas. In heat sound waves travel faster because the heat gives them more energy which allows them to vibrate faster.
A total of <u>20</u> amino acids compose the majority of protein in living things and nine are <u>essential</u> to human.
- All living organisms, from bacteria to people, depend on amino acids for survival.
- The same 20 types of amino acids are present in all living things.
- Only 21 amino acids are required by the human body to create all the proteins required for growth and function.
- Your body can create thousands of different types of proteins with only the same 21 amino acids because they can be ordered in a wide variety of ways.
- The body is unable to produce essential amino acids. They must therefore originate from food.
- Histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine are the nine essential amino acids.
learn more about amino acids here: brainly.com/question/1201532
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Hemoglobin has tetrahedral structure containing four heme groups that surround a globin group.
Heme is ringlike organic compound also known as a porphyrin to which an iron atom is attached. There are four iron atoms that bind four oxygen atoms and transport them to tissues.