In Australia, most of the typical mammalian roles are filled by marsupial mammals. There is a marsupial "wolf," several species of marsupial "mice," marsupial "squirrels," and marsupial "anteaters." This example shows the importance of the study of in understanding evolution.

Match the following terms and definitions. the transformation of a larva to an adult; occurs only in animals having great differences in form between the larva and adult pupa 2. type of mammal that lays eggs monotreme nymph the part of certain insect life cycles in which the young animal has no wings or reproductive organs the developmental stage between larva and adult in insects undergoing metamorphosis metamorphosis 5. the male gonad which produces sperm testes