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.

C14 dating since carbon is present in both living and no living objects .

By water evaporation from the leaves is created a negative pressure at the top of the tree that promotes the ascension  of the water through channels that are called xylem. there are also two molecule forces that are involved: the intra-water molecules cohesion (water molecules stick to each other) and the adhesion when the water molecules stick to the channels they are running in. this is what enables water to go from the roots to the top of a tall tree.

Ithink it's c (70)

Geographic isolation.glad i could : )