1. 7th Diversity of Living Things (Mod B) U1L2
Natural Selection
7th Diversity of Living Things (Mod B) U1L2
What is Natural Selection by Stated Clearly -

2. The Idea of Evolution Charles Darwin British Naturalist
Travels with the H.M.S Beagle from 1831 – 1836
Made many observations, perhaps most important ones from Galapagos Islands (off west coast of South America)
Similar plants and animals on different islands had different characteristics
Look at the map!
Charles Darwin BrainPop

4. Evolution = the process by which species change over time
Species = group of organisms that can mate to produce fertile offspring
Population = all the individuals of a species that live in an area at the same time

5. He saw that the different species had different characteristics
Darwin collected species of finches from the different islands and from mainland South America
He saw that the different species had different characteristics
Concluded that all may have come from the same species & changed over time to adapt to the different environments on the different islands
Amoeba Sisters Natural Selection -

6. Four parts of natural selection
1. Overproduction: species produce more offspring than will survive

7. 2. genetic variation – the offspring all have characteristics that differ

8. 3. adaptation – the traits of some of the offspring are better suited for a particular environment

9. 4. selection – the offspring with adaptations that help them survive in a particular environment are most likely to survive and pass their traits on to their offspring

11. I should also understand that…
The environment changes over time.
If a species does not have adaptations to help it survive, it will go extinct (all members of that species dies)
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