An amino acid molecule includes a central carbon atom bonded to , a carboxyl group, and a hydrogen atom.
an amino group and three fatty acids

an amino group and a nucleic acid

a nucleic acid and an R group

an amino group and an R group

HEL PLEAS

an amino group and an R group

"Each of the 20 amino acids has a central carbon atom with four covalent bonds. These bonds link the carbon atom to an amino group ( NH2 ), a carboxyl group ( COOH ), a hydrogen atom, and an R group. The R group can be a carbon side chain, a hydrogen atom, or a functional group. " from my textbook.

Explanation:

the earth is thought to have been formed about 4.6 billion years ago by collisions from a cloud of hydrogen, helium, rock, ice and other materials. these were pulled together by gravity to form objects in and around earth like- asteroids and small early planets called planetesimals.

so, the best possible answer to this question will be option d- to harden materials to form different parts of earth’s layers