<P> The remarkably successful Hymenoptera appeared as long as 146 million years ago in the Cretaceous period , but achieved their wide diversity more recently in the Cenozoic era , which began 66 million years ago . A number of highly successful insect groups evolved in conjunction with flowering plants , a powerful illustration of coevolution . </P>
<P> The remarkably successful Hymenoptera appeared as long as 146 million years ago in the Cretaceous period , but achieved their wide diversity more recently in the Cenozoic era , which began 66 million years ago . A number of highly successful insect groups evolved in conjunction with flowering plants , a powerful illustration of coevolution . </P>
upon what group of plants do many insects depend
upon what group of plants do many insects depend
flowering plants
flowering plants