Two limits to cell growth is by rates of protein synthesis and by the folding rates of its slowest protein
A country like China would probably be in Stage 4 of the population with the low birth rate and low death rate due to their economic power have technology to prolong and save their citizen from diease and condoms
About six months for the women
Plants and animals are both "organisms" or "living organisms" if you prefer.
An organism is basically a group of different organs functioning together (hope this was the easiest way to explain it).
Hope it helped,
Happy study/ homework/ exam!