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This quiz contains 7 questions from a mix of 1 subtopics.
are the remains of organisms from millions of years ago, which are found in rocks.
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Why are fossils used to as evidence for evolution?
Fossils can be made in many ways
Fossils can form from animal or plants
Fossils show us how species have changed over millions of years
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Why is the fossil record incomplete?
(Select all that apply)
Some organisms are soft-bodied so do not fossilise well
There are different types of fossils
Some fossils formed long ago may have been destroyed since
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Three main ways fossils can form
footprints / bones / sediment / decay / amber / minerals / casts
- Hard body parts, such as and shells, which very slowly, are gradually replaced by , forming rock-like substances.
- Animals can leave impressions or , such as or burrows. These become covered by layers of , which eventually become rock.
- Some parts of organisms may not decay at all. For example, dead animals and plants can be preserved in , peat bogs, tar pits, or in ice.
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Why might a dead animal be preserved in a tar pit, rather than decay?
Too acidic for decay to take place
Not enough oxygen for decay to take place
Too cold for decay to take place
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What does it mean for a species to become extinct?
The species undergoes a genetic change
There are no remaining individuals of a species still alive.
The species is affect by a new disease
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Suggest three ways a species may become extinct.
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