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Evolution! Biology Standard 7 What is Evolution? • Change of an organism over time. • Modern orgs descended from past orgs. • Charles Darwin ! Simple to complex organisms Species •Considered separate species if they cannot interbreed •Same species create viable offspring NO Dog-Cat Babies! YES Panda Babies! Darwin • English! • HMS Beagle in 1831-1836. Collected animal/plant specimens. • World was biodiverse: many diff. types of species. Species He Saw Species He Saw Species He Saw Charles Darwin 1859 Modern descent: orgs change in response to environment. Also Talked About… • Evolution = SLOW! • If an org. has traits that allow them to survive and reproduce, they are fit (Darwinian fitness). So… Am I Fit?? Not Fit…Extinct! Dodo Not Fit…Extinct! Passenger Pigeon Not Fit…Extinct! Stellar Sea Cow Adaptation • Trait that allow orgs to be better suited to environment. • Orgs cannot choose to adapt naturally through environmental pressures. • Org adapts to environment SURVIVES (passes traits to offspring). • Org. cannot adapt DIES!! • Darwin termed this natural selection.