The process in which the environment<span> selects </span>organisms<span> that will survive is called natural selection. It starts with overproduction; when an </span>organism<span> produces more offpsrings than can survive. The second is variation. Because there are so many offsprings, there will be variations.</span>
"An example of mutualism in the rainforest is the pollination of the Durian tree by bats."
The word that you are looking for is complex.
