Answer: Portrayal of thermal convection as a mechanism.
if its not right im srry :(
but if it is your welcome :D
The answer is K-selected.
The population size of K-selected species is fairly constant in time, unlike the population size of r-selected species. r-selected species are usually bellow carrying capacity and the population size is density independent. On the contrary, K-selected species are usually near or at carrying capacity and the population size is density dependent.
Nuclear envelope is the answer
