A signal to reabsorb more water and salt. Have a good day =D
Starfish has a endoskeleton
a coral has a exoskeleton
sponge has neither
Answer:
Within a protein, multiple amino acids are linked together by peptide bonds, thereby forming a long chain. Peptide bonds are formed by a biochemical reaction that extracts a water molecule as it joins the amino group of one amino acid to the carboxyl group of a neighboring amino acid. (from google)
Explanation: hope this helps! :)
