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what is mean by co evolution?
 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.Coevolution is likely to happen when different species have close ecological interactions with one another. These ecological relationships include:
    Predator/prey and parasite/host
    Competitive species
    Mutualistic species
Plants and insects represent a classic case of coevolution—one that is often, but not always, mutualistic. Many plants and their pollinators are so dependent on one another and their relationships are so exclusive that biologists have good reason to think that the “match” between the two is the result of a coevolutionary process.


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