AST251H1 Lecture : lecture note

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Today characteristics of life on earth to inform use where to look for life. 2 hr and mc and sa, s-z, mc254, 1-6. 1. What life should have, key words necessary and sufficient, water is necessary for life, Just having order isn t enough not sufficient, crystals have order but not life. Order, always come in size with certain structure, Another defining attribute is reproduction, key feautures is pass on properties of parent to offspring, exemptions to the rule, mule, but mules are sterile, so violate reproduction criteria and therefore hard to define life. All life consumes and ultilizes energy, need to eat, energy can come from weird locations, tube worms life from bacteria inside them and they live by h2s. Whales descended from other mammals before them. Anz vs aristotle who said life did not change. Darwin created consistent theory of evolution, 1 to 2 decades after trips around the world.

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