Pollination can occur in several different ways, but usually plants rely on animals or wind to help pollinate them and help distribute their pollen and seeds. However, a new study shows that apple trees produce bigger, rounder, and more desirable fruit when pollinated by insects in particular. Researchers studied Cox and Gala apples, two popular varieties in Britain, and valued the annual contribution of insects to these fruits at just under £37 million (60 million USD).