Development of Understanding (AQA GCSE Biology Combined Science): Flashcards
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What are fossils?
What are fossils?
Remains of living things from millions of years ago
What evidence do fossils provide?
What evidence do fossils provide?
Evidence for evolution by natural selection
1st way fossils form?
1st way fossils form?
Traces preserved (footprints, burrows, root marks)
2nd way fossils form?
2nd way fossils form?
Hard parts replaced by minerals
3rd way fossils form?
3rd way fossils form?
Soft tissues preserved in special conditions
Conditions for soft tissue preservation?
Conditions for soft tissue preservation?
No oxygen, no water, low temperatures
What is extinction?
What is extinction?
No living individuals of a species left
3 biological causes of extinction?
3 biological causes of extinction?
New diseases, new predators, new competitors
2 environmental causes of extinction?
2 environmental causes of extinction?
Slow environmental changes or catastrophic events
Why more fossils of vertebrates than soft-bodied animals?
Why more fossils of vertebrates than soft-bodied animals?
Bones hard & preserve better; soft bodies decay quickly