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Unit 2 Vocab Quiz 2

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Across
6
Find things underwater using sound waves
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A person who strongly believes in changing something and works hard to make change happen
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Reptiles (only able to control body temp by using its surroundings
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Ship used to travel underwater for research without people inside
Down
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Travel back and forth from one place to another
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Easily harmed
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Mammals (constant body temperature)
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No longer existing; completely died out
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To shed skin
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Birds' feathers