Question

if ###### are fossils from organisms that lived 1bn years ago, and @@@@@@ are fossils from 250 thousand years ago. what time ranges are indicated by layer a?

b?

c?

graph interpretation:

Explanation:

Step1: Analyze layer A

Layer A has fossils from 250 thousand years ago. So the time range for layer A is from 250,000 years ago.

Step2: Analyze layer B

Layer B is between layer A (250,000 years ago) and layer C (1 billion years ago). So the time range for layer B is between 250,000 years ago and 1 billion years ago.

Step3: Analyze layer C

Layer C has fossils from 1 billion years ago. So the time range for layer C is from 1 billion years ago.

Answer:

A: 250,000 years ago.
B: Between 250,000 years ago and 1 billion years ago.
C: 1 billion years ago.