Life and Geologic Time

Question 1

Scientists used major changes in life forms in the fossil record to form the geologic time scale.

Revolt · Accepted Answer

T

Question 2

The division of Earth’s history into smaller units makes up the ____.

Revolt · Accepted Answer

geologic time scale

Question 3

Geologic time is divided into units based upon types of ____.

Revolt · Accepted Answer

organisms

Question 4

Dog breeding is an example of natural selection.

Revolt · Accepted Answer

F

Question 5

Plate tectonics may affect organic evolution because movement of plates may cause a change in ____.

Revolt · Accepted Answer

the environment

Question 6

Changes in the trilobite exoskeleton can be attributed to ____.

Revolt · Accepted Answer

both a and b

Question 7

If a species can adapt to a changing environment, or ____, its descendants will survive.

Revolt · Accepted Answer

evolve

Question 8

____ on the geologic time scale are marked by major, striking, and worldwide changes in the type of fossils present.

Revolt · Accepted Answer

Eras

Question 9

Trilobites are index fossils because they ____.

Revolt · Accepted Answer

all of the above

Question 10

The longest subdivision in geologic time is a(n) ____.

Revolt · Accepted Answer

eon

Life and Geologic Time Answers