What is a mass extinction?

What is the general cause of extinction? _____

(a) Describe some of the habitats rodents have occupied: _____ (b) Describe some adaptations of rodents: _____

What anatomical feature do all rodents have?

A zoo wants to set up natural habitats in which to exhibit its animals. Unfortunately, some animals will eat some of the others when given the opportunity. How can a graph model and a coloring be used to determine the number of different habitats needed and the placement of the animals in these habitats?

(a) When did the mammals first evolve? _____ (b) When did placental mammals split from the marsupials? _____ (c) Suggest why the mammals underwent such a major adaptive radiation after the dinosaurs died out? _____ (d) Suggest why marsupials remained the dominant mammalian group in Australia after the split between the marsupial and placental mammals: _____