Sexual selection is often powerful enough to produce features that are harmful to the individual's survival.For example, extravagant and colorful tail feathers or fins are likely to attract predators as well as interested members of the opposite sex.After all, what female Mormon cricket (bottom right) could resist the gift of a juicy sperm-packet?Going to even more extreme lengths, the male redback spider (bottom left) literally flings itself into the jaws of death in order to mate successfully.Coevolution is likely to happen when different species have close ecological interactions with one another.These ecological relationships include: Plants and insects represent a classic case of coevolution — one that is often, but not always, mutualistic.Some Central American Acacia species have hollow thorns and pores at the bases of their leaves that secrete nectar (see image at right).These hollow thorns are the exclusive nest-site of some species of ant that drink the nectar.

They should view and value science as a multi-faceted, flexible process for better understanding that world.Science is an inspiring process of discovery that helps satisfy the natural curiosity with which we are all born.Unfortunately, traditional instruction that misrepresents science as a body of facts to be memorized and the process of science as a rigid 5-step procedure can deaden students' spirit of inquiry.Coevolution The term coevolution is used to describe cases where two (or more) species reciprocally affect each other's evolution.So for example, an evolutionary change in the morphology of a plant, might affect the morphology of an herbivore that eats the plant, which in turn might affect the evolution of the plant, which might affect the evolution of the herbivore..so on.As for how Pelosi's been dragged into this -- Robles says she's suing her for assault because Pelosi advocates "violence toward President Trump supporters." Robles wants damages in excess of million.We've reached out to UC Berkeley and Pelosi's office, so far no word back.