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Published byAllison Easter Wilcox Modified over 9 years ago
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Life and Geologic Time Sci 4.1
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Geologic time scale: history of earth most units based on types of living things
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Question 1
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Units: Eon – longest Era Period Epochs – shortest
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Question 2
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Organic evolution: time how species change over time
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Okapi: Relative of the giraffe
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Question 3
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Species: Members reproduce with each other to produce viable offspring. viable: can reproduce
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Question 4
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Natural Selection Charles Darwin’s idea organisms best suited for their environment are “selected” by nature all others become extinct.
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Question 5
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Changes in environment can pressure species to evolve
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Question 6
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Artificial selection: people, not nature, doing the selecting domesticated animals, hybrid plants
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Question 7
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Trilobites (3 lobes) lived in oceans >200 mil. years, extinct now hard exoskeletons made good fossils changed over time
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Question 8
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Could’ve been 1 st creatures to have eyes.
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Some species lost eyes over time.
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What’s not needed can be lost over many generations.
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Pangea (Pangaea) when all continents came together ~200 mya trilobites became extinct
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Question 9
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