Middle School Life Science Quiz
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BIOLOGICAL EVOLUTION: UNITY AND DIVERSITY
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Fossil records show patterns of diversity over time, though they are incomplete. In a stack of layers (oldest to youngest), fossils are:
- Layer 6 (oldest): 3 types (shell A, shell B, algae)
- Layer 5: 3 types (shell A, shell B, algae)
- Layer 4: 1 type (algae)
- Layer 3: 1 type (algae)
- Layer 2: 4 types (shell C, crab, fish, algae)
- Layer 1 (youngest): 4 types (shell C, crab, fish, algae)
What evidence shows a change in diversity over time in this fossil record?
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