Which step happens first to a chromosome during cell division? A. Nucleotides are added to each half of a DNA molecule.
B. Two identical DNA molecules form.
C. Each half of a DNA molecule acts as a template.
D. A DNA molecule unwinds, exposing the bases on each half.

well, that's easy; the answer's c, "it reduces contamination of the water and substrate of the estuary."

the answer is: trichonympha lives in the gut of termites and digests cellulose eaten by the termite.

this is an example of a symbiotic association of a protozoan with its mode of association.

hope i

-lavira: )