The index fossil of a type of trilobite is discovered in layer A of a set of rock layers found at three different sites of a field investigation. Which conclusion can be made about the rocks in layer A at all three sites?

EVIDENCE FOR EVOLUTION

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

A	The rocks are all different ages
B	The rocks are all about the same age
C	The rocks were formed from melting magma
D	The rocks were formed during a catastrophic event

Explanation:

Detailed explanation-1: -How can scientists use index fossils to determine the absolute age of rock layers in different parts of the world? an index fossil discovered in rock layers in different areas of the world indicates that the rock layers in these areas formed during the same time period.

Detailed explanation-2: -Sandstone contains fossils of creatures such as trilobites, brachiopods, crustaceans, bryozoans and plants. Remains of land animals like mastodons and dinosaurs are much more likely to be found in sandstone.

Detailed explanation-3: -Answer and Explanation: The characteristics of the trilobites that explains them as good index fossil are that they were widespread and distinct in their existing period.

Detailed explanation-4: -An index fossil is typically preserved in sedimentary rock layers. Notice that most index fossils are marine animals because they already live in a location where their remains are easily buried and preserved.

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