Charles Darwin! Darwin and a scientist contemporary of his, Alfred Russel Wallace, proposed that evolution occurs because of a phenomenon called natural selection.
Evolution theory is a shortened form of the term "theory of evolution by natural selection," which was proposed in the 19th century by Charles Darwin and Alfred Russel Wallace.
I don't see any answers to choose from, but when an animal eats a plant, travels, and then *poops* it out, the seeds are usually in the scat, thus spreading the plant and allowing it to reproduce.