According to some research it is estimated that about 20% of americans of the age of 12 are infected with the human papilloma virus.
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The answer to your question is D
In biology, the active site is the region of an enzyme where substrate molecules bind and undergo a chemical reaction. The active site consists of residues that form temporary bonds with the substrate (binding site) and residues that catalyse a reaction of that substrate (catalytic site).
Animals ( or plants ) store solar energy as chemical energy between atoms of their molecules.
For example : ATP is phosphate energy bonds stored by animals in their molecules.
For more stable form animals also store energy in carbon bonds called carbohydrates. The most common e carbohydrates are starch, sugar and fats. Animals have enzymes to convert these forms of energy into actual form which they use for their activities like move, run or fly.
