The larvae of some insects are merely small versions of the adult, whereas the larvae of other insects look completely different from adults, eat different foods, and may live in different habitats. Which of the following is most directly involved in the evolution of these variations in metamorphosis?
A) artificial selection of sexually immature forms of insects B) changes in the homeobox genes controlling early development C) the evolution of meiosis D) the origin of a brain
Which of the following inferences can best be made from the fact that arthropods colonized land about 100 million years before vertebrates?
A) arthropods evolved after vertebrates did B) extant terrestrial arthropods are better adapted to terrestrial life than are extant terrestrial vertebrates C) vertebrates evolved from arthropods D) arthropods have had more time to coevolve with land plants than have vertebrates