For the carbon cycle and the nitrogen cycle to function properly, which organisms must always be present? a) decomposers b) herbivores c) parasites d) predators

during the process of dna replication, brdu can replace thymidine and incorporate into the newly synthesized dna, cell proliferation thus can be reflected in the extent of brdu incorporation.

1. b.

2. d.

3. a.

5. d.

6. c.

these are the only ones that i know, i hope this , and good luck.