Fossils (OCR GCSE Biology A (Gateway Science Suite)): Flashcards
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What are fossils?
What are fossils?
Preserved remains or traces of organisms from millions of years ago
3 ways fossils can form
3 ways fossils can form
- Preservation without decay 2. Mineral replacement 3. Preserved traces
Conditions that prevent decay in fossil formation
Conditions that prevent decay in fossil formation
Absence of oxygen or moisture
In mineral replacement, what replaces bones/teeth/shells?
In mineral replacement, what replaces bones/teeth/shells?
Minerals
Examples of preserved traces in fossils
Examples of preserved traces in fossils
Footprints, burrows, rootlets (plant roots)
How do fossils provide evidence of evolution?
How do fossils provide evidence of evolution?
Show how anatomy of organisms changed over time
What are evolutionary trees?
What are evolutionary trees?
Diagrams mapping relationships between species
Why are early life fossils rare?
Why are early life fossils rare?
Early life forms were soft-bodied and decayed completely
Geological processes that destroy fossils
Geological processes that destroy fossils
Erosion, volcanic activity, tectonic movements
Where are fossils typically found?
Where are fossils typically found?
Embedded in rock layers