If single-celled organisms did not undergo the cell cycle, they could not -- A-Reproduce.

B-die.

C- replicate RNA.

D- function.

b - the respond is innate and varies over time.

good luck!

population. population is the number of people or animals in a particular place. an example of population is over eight million people living in new york city.

here is your answer hope i .

since there are no options posted i'll give you a few examples.

a dolphin's flipper, bird's wing, cat's leg.