Which is an unintended consequence of the widespread use of pesticides on corn crops?

increased amount of corn grown each year
the rise of pesticide–resistant insects
decreased cost of producing corn
the deaths of insects that feed on corn

Scientists discovered fossils in several layers of the earth you see here. they found fossils of algae, snails, and clams in layer d. given that information, where do you think they found fossil evidence of simple land plants and amphibians?