If there are 20 different amino acids, how do they know how to line up? which order should they be in? which molecule them do this? a. messanger rna(mrna)b. enzymesc. transfer rna(trna)d. rna(hrna)

im not intirely sure but i think the anwser is d relative humidity

here is the answer

water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.