Biology – Evolution Study Notes
Evolution: Organisms changed because they had to adapt to the changing earth
Charles Darwin: had credit for being first to say why evolution occurred with evidence, but
not the first with the idea.
2 Main ideas:
1) Organisms are products of a history of descents with modifications from common ancestors
2) The principle mechanisms is the natural selection of hereditary variations.
1 Organisms change from one common ancestor with changes over time
-Started with one, then changes differ between each species.
2. Nature will favour changes that survives
-Accumulation of traits that allows the to survive
-Whatever that doesn’t work well will die
-Earth changes + Mutation + trait changes.
Controversy: People thought that the earth was unchanged
-Believed that god made everything just as it is today
-Said that things didn’t change, as that’s how god says it should be