Some coral reefs grow larger in water that has the right amount of salt. What kind of characteristic is this? A. behavioral
B. environmental
C. organic
D. individual

Six amino acids have side chains that are polar but not charged. these are serine (ser), threonine (thr), cysteine (cys), asparagine (asn), glutamine (gln), and tyrosine (tyr). these amino acids are usually found at the surface of proteins, as discussed in the proteins 2 module.

Giga is the second highest prefix on the normal scale, the first is terra.