How do scientists know how old a fossil is Day 3 and Day 4

Day 3

Trilobites lived 300 _____ years ago.

• thousand

• million

• billion

Day 3

A marker fossil can help scientists figure out another fossil's ________.

• color

• weight

• age

Day 3

A trilobite was an animal that lived in the ________.

• ocean

• ground

• mountain

Day 3

Since trilobites were so common in the past, they made many fossils. What creature living today might make a lot of fossils, like the trilobite did?

• Polar Bear

• Buffalo

• Dog

• Caterpillar

Day 4

What can scientists learn by studying the fossil record?

• to tell when different plants and animals lived

• to tell when these scientists disappeared

• to tell us what color they are

• to tell us how big they were

Day 4

What kind of fossil could you find in a rock that is 100 million years old but not in a rock that is 50 million years old?

• fish

• mammals

• dinosaurs

• insects

Day 4

If you found a rock with a dinosaur footprint in it, would you expect to find a trilobite fossil in the same rock? Why or why not?

• Yes, because they lived around the same time

• No, because trilobites have been extinct for 250 million years and dinosaurs disappeared 65 million years ago.

Day 4

An ammonite was a tiny sea animal that lived between 65 million and 400 million years ago. Choose the timeline that has the bar filled in correctly of when the ammonite lived.

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