Patterns of Change in Life on Earth

​Unit 5 Lesson 2 Check-Up

By Morgan Routhieaux

Open Ended

Why are the fossils above and below the light-colored layer of rock different?

Multiple Select

According to scientists, how are the bones in the fin structure of the Tiktaalik evidence of a transition from fish to amphibian? Select all that apply.

• It has fins like a fish.

• It has limb bones like an amphibian.

• It is older than fish fossils.

• The limb bones do not look as developed as they do in the amphibian.

Multiple Choice

In general, biodiversity on Earth ________ over time.

• increases

• stays the same

• dramatically decreases

• Platypus

Multiple Select

What types of evidence have scientists used to infer when single-celled life first appeared on Earth? Select all that apply.

• transitional fossils in ancient rocks

• certain forms of carbon in ancient rock

• fossil evidence, such as stromatolites

• evidence of extinction events