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Crossword- Sara fike

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Across
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enables all the organisms to survive.
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process by new species form.
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structures that evolved in two living organisms
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Examples of these are ammonites
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by which heritable traits increase an organism's chances of survival and reproduction. atural selection)
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change in allele frequencies
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the separation of members of populations via physical barrier.
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Naturalist, father of evolution
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a chemical reaction occurs.
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a scientific theory
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the movement genes over time.
Down
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organisms are thought to have the same ancestor, separated over time.
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birth weight.
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process which species form
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one organism lives inside the other.
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The termination of a species forever.
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In biology usually refers to the heritable differences within a species.
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the ability to survive to reproductive age