BIOLOGY 1M03 Lecture 2: Notes - Package 5
31 Jan 2018
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1 example: humans are an example of a biological species that has evolved, possibly of interest, since many of your friends are probably humans, humans seem unique: History: there are a lot of steps (and a lot of divergences) between us and the last universal common ancestor of life, more than 3 billion years ago, some key steps: Periods may be punctuated by major events. People started talking about periods before they had good measures of how long ago things happened. And never getting stuck, e. g. vertebrate eyes: a changing environment provides opportunities to try new combinations and build in unexpected directions. Physical changes: physical changes often provide species with new adaptive challenges and opportunities, global climate change, continental drift, geological changes. New environments can arise (e. g. , mountain ranges, desert basins) Geology may also change connections between two populations without a large e ect on how they live.
