Peggy Greb/U.S. Department of Agriculture It’s a bug’s world. Zoologist Eric Hoberg ; “balances bugs.” Learn more about how bugs balance nature on the following pages. Up Next How does biodiversity help an ecosystem? 5 Ideas for Doubling the World's Food Supply The Pacific Garbage Patch Explained -- New Updates The Ultimate Save the Rainforest Quiz What happens when a keystone species goes extinct?