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What is direct evidence of past life and evolutionary change?
Fossil record
Homologous structures are evidence for
a common ancestor
Which scientific technique allows scientists to compare genetic material between species?
DNA analysis
Embryology provides evidence for evolution by showing what?
similar early stage development in related species
What is the fossil record?
a record of the different types of organisms that lived in the past
What is biodiversity
Biodiversity refers to the number and range of different species that exist on Earth
What is the process of speciation?
1. Variation, 2. Isolation, 3. Selection, 4. New species produced
State the 5 things used as evidence for evolution
Fossil record, comparative anatomy, Embryology, Vestigial structures, DNA
What is a fossil?
Fossils are the preserved evidence in rocks or soil of organisms that once existed on earth
Name 3 types of fossils
Original, Replacement, Carbon film, indirect, petrification
Which type of preserving environment best preserves soft tissues?
Amber
Name the 5 types of preserving environments
Tar/Asphalt, dry air, amber, permafrost, peat
What does the relative dating technique do?
It compares the age of one fossil with another to determine which is older
Name 2 types of absolute dating techniques
Radioactive dating and tree rings
What are stromatolites?
Stromatolites are laminated fossils formed by blue-green algae and sediment
How are Stromatolites formed?
Sediment sticks to the surface of the living algae, forming a crust. The algae grow through the sediment to form a new layer of living matter
