Exam 23: Animal Origins and Diversity

The hominids-the evolutionary lineage that led to humans-separated from the other ape lineages about _______ million years ago in Africa.

Two genera of hominids (totaling at least four different species)coexisted in Africa approximately _______ years ago.

All echinoderms have

Along a rocky tide pool,you discover an animal that has a hemisphere-shaped body covered with spines that move when you touch the animal.This animal most likely belongs to the _______ group.

Evolution of jaws first occurred in the group of fishes known as the

Most amphibians breathe air by means of

Because all animals must take in nutrients from their environment and digest their food internally,the term applied to the nutritional mode of animals is

The sharks,skates,and rays are members of the vertebrate group known as

The ancestor of the animal clade was probably a(n)

Which feature can be helpful in classifying organisms and is unrelated to the body plan of an organism?

The most diverse (specious)group of insects consists of the

Which hominid is the oldest?

Which organisms are members of the lophotrochozoan lineage?

Early in its evolutionary history,the primate lineage split into two main branches: the _______ and the _______.

Many amphibians return to water to lay their eggs because

Which statement about birds is true?

Which feature is not a unique characteristic of the vertebrate body plan?

A lophotrochozoan with eight overlapping calcareous plates and a feeding structure called a radula belongs to which group?

Insects whose hatchlings are sufficiently similar to the adult form to be easily identifiable are those that have

Which characteristic is not associated with a parasitic lifestyle as seen in tapeworms and flukes?