Which of the following statements about Hox genes is true?

A. They control the development of specific body regions, from anterior to posterior

B. Only animals have Hox genes

C. Hox Genes cooperate to produce the positional patterns of an organism

D. A & B

E. A, B, & C

Which of the following are the only extant animals that descended directly from dinosaurs?

A. mammals

B. Snakes

C. Lizards

D. Crocodiles

E. Birds

The First fish with jaws and bony skeletons first appear in the fossil record of the:

A. Cambrian

B. Silurian

C. Devonian

D. Triassic

E. Carboniferous

The origin of the chordates occurred at roughly the same time as

A. The origin of lancelets

B. origin of the Ediacaran fauna

C. Cambrian explosion

D. first primates invaded land

E. Permian extinctions

During this period of time the land surface of the Earth was dominated by low-lying swamps and the first great forests of vascular plants that did not produce flowers.

A. Silurian

B. Jurassic

C. Cenozoic

D. Carboniferous

E. Cretaceous

Almost all the major body plans seen today appeared in the fossil record over 500 million years ago at the beginning of the:

A. Permian

B. Cambrian

C. Edicaran

D. Carboniferous

E. Cretaceous

The most recent common ancestor of all land plants was probably similar to modern-day members of which group?

A. Charophytes

B. green algae

C. red algae

D. brown algae

E. angiosperms

Through time, the lineage to modern whales shows a change from four-limbed land animals to aquatic animals with two flippers. This is best explained by:

A. natural selection

B. feedback inhibition

C. natural philosophy

D. creationism

E. the hierarchy of the bio organization of life