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Unit 2 Vocab Quiz 2

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