Using the drop-down menus, label the parts of an amino acid.

You didn't provide a photo for me to base my answers off of. But amino acids are made up of an amino group, an acid group, and the side chain.

a hydrogen, an α- carboxyl group, an α-amine group, and an R-group? If i'm right.

Explanation:  remember they can be a " side chain " - 7th grader xD

its 42

i say its d?

if the type of the food available changes, then the frequency of beak types will change, because birds with beaks more suited to the available food will be more successful over time.