Which one of these protein structures shows the folding of the polypeptide which is held in place by interactions between R groups by H, ionic, and covalent bonds as well as strong disulfide linkages.

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

this would be called the responsiveness