Ch7 Sec 2

Question 1

Homologous structures

Answer 1

Body parts that are structurally similar in related species.

Question 2

Mold

Answer 2

A type of fossil formed when a shell or other hard part of an organism dissolves, leaving an empty space in the shape of the part.

Question 3

Cast

Answer 3

A type of fossil that forms when a mold becomes filled in with minerals that when harden.

Question 4

Petrified fossil

Answer 4

A fossil formed when minerals replace all or part of an organism.

Question 5

Trace fossil

Answer 5

A type of fossil that provides evidence of the activities of ancient organisms.

Question 6

Paleontologist

Answer 6

A scientist who studies fossils.

Question 7

Gradualism

Answer 7

The theory that evolution occurs slowly but steadily.

Question 8

Punctuated equilibria

Answer 8

The theory that species evolve during short periods of rapid change.

Question 9

Comparative anatomy

Answer 9

The comparison of the structures of different organisms.