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

A. Decomposers and similar types of bacteria are the linchpin between carbon and nitrogen cycles. Without them, organisms wouldn't be able to be returned to the soil and turn into the carbon and nitrogen compounds that fuel each of these processes.

The arrangements of lipids in the membrane makes the cell semi permeable .

C) to ensure each new cell has an exact copy of the dna