Life and Geologic Time Sci 4.1 Geologic time scale: history of earth most units based on types of...
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Transcript of Life and Geologic Time Sci 4.1 Geologic time scale: history of earth most units based on types of...
![Page 1: Life and Geologic Time Sci 4.1 Geologic time scale: history of earth most units based on types of living things.](https://reader036.fdocuments.in/reader036/viewer/2022062314/56649ed35503460f94be409b/html5/thumbnails/1.jpg)
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 1st 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