What distinguishes bacteria from archaea?
a. all archaea live in extreme environments, and bacteria do not.
b. all archaea are unicellular, and some bacteria are multicellular.
c. archaean dna is made up a different set of nucleotide bases than is bacterial dna.
d. archaean cell walls are made up of different compounds than are bacterial cell walls.

small, big, or no change could occur in the phenotype. it could cause something as simple as a cats ears to curl backwards or something as frighting as death. it could also occur in the protien-coding area and have an effect on that but no effect on the amino acids. what has to occur is a changing in the hox gene or the control gene.

c.           is the correct answer