Which of the following properties characterizes bases? A. ability to react with metals
B. sour taste
C. bitter taste
D. two of the above

the backbone of the dna and rna compound is sugar phosphate.

i think this picture will you.

the species living around the vents are especially good at dispersal.  

deep-sea vent originates on the floor of the ocean when seawater circulates through hot volcanic rocks, usually situated where the new oceanic crust is being produced.  

biological dispersal refers to the movement of species from their location of birth to their site of breeding, or from breeding site to another. similarly, the oceanic dispersal refers to the movement of the species from one land mass to another by sea crossing.