Life and Geologic time – Flashcards
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Changes in the trilobite exoskeleton can be attributed to ____.
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d.
both a and b
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Changes in the environment result in ____.
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physical changes in species
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____ on the geologic time scale are marked by major, striking, and worldwide changes in the type of fossils present.
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Eras
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____ is a process by which organisms with characteristics suited to the environment will survive and reproduce.
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Natural selection
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Scientists used major changes in life forms in the fossil record to form the geologic time scale.
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T
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If a species can adapt to a changing environment, or ____, its descendants will survive.
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evolve
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Dog breeding is an example of natural selection.
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F
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Geologic time is divided into units based upon types of ____.
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organisms
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The division of Earth's history into smaller units makes up the ____.
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geologic time scale
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Trilobites are index fossils because they ____.
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all of the above
