General Biology 2: Geologic Time Scale

Subject: Biology 2

Topic: Geologic Time Scale

Difficulty: Medium

Questions: 5

Passing Score: 70%

Question #1 1 point

Why are fossils essential in constructing the geologic time scale?

A: Show Earth’s exact age

B: Prove humans existed in all eras

C: Identify organisms in specific times

D: Show rock composition

Question #2 1 point

A student groups several periods together based on similar life forms and environmental conditions. Which level of geologic time is the student describing?

A: Epoch

B: Period

C: Era

D: Eon

Question #3 1 point

Most of Earth’s history occurred before complex life became common. Which eon covers more than 85% of Earth’s total history?

A: Phanerozoic

B: Proterozoic

C: Archean

D: Precambrian

Question #4 1 point

During a museum visit, a display describes an “Age of Fishes” and the formation of the first forests on land. Which geologic period is being described?

A: Silurian

B: Devonian

C: Carboniferous

D: Ordovician

Question #5 1 point

Scientists studying early human ancestors focus on a time marked by cooler climates, expanding grasslands, and the appearance of australopithecines. Which epoch best fits this description?

A: Miocene

B: Pleistocene

C: Pliocene

D: Holocene

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