The Development of Understanding of Genetics & Evolution (AQA GCSE Biology): Flashcards
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Practise the cards
14 cards from this deck
Definition of fossils
Definition of fossils
Preserved remains/traces of organisms from millions of years ago
Where fossils are found
Where fossils are found
Embedded in rock layers
Conditions for preservation without decay
Conditions for preservation without decay
Absence of oxygen or moisture
What can be preserved without decay
What can be preserved without decay
Soft tissues or organic material
2nd fossil formation method
2nd fossil formation method
Mineral replacement
Body parts replaced by minerals
Body parts replaced by minerals
Teeth, shells, and bones
3rd fossil formation method
3rd fossil formation method
Preserved traces
Examples of preserved traces
Examples of preserved traces
Footprints, burrows, or rootlets
Main importance of fossils
Main importance of fossils
Provide evidence for evolution and history of life
What changes over time in fossils
What changes over time in fossils
Anatomy of organisms
What fossil similarities indicate
What fossil similarities indicate
How closely related species are
What evolutionary trees show
What evolutionary trees show
Relationships between species
Why early fossils are rare
Why early fossils are rare
Early organisms were soft-bodied & decayed completely
Geological processes destroying fossils
Geological processes destroying fossils
Erosion, volcanic activity, tectonic movements