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The place where a plant or animals lives is its (a)   .

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The very old remains of a living thing is a/an (a)   .

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An animal that has hair or fur and produces milk for its young is a/an (a)   .

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A species that is no longer found on Earth is a/an (a)   .

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An animal that has gills when it is young and lungs as as adult is a/an (a)   .

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An animal that has a backbone is a/an (a)   .

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A vertebrate having lungs, wings, and feathers is a/an (a)   .

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An animal that has jointed legs and an exoskeleton is a/an (a)   .

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The series of bones that runs down the back of some animals is a/an (a)   .

What materials could you use to make a model of an arthropod?

How do you think scientists know that saber-toothed cats ate meat?

What might happen to the animals that live in an area where humans are moving in?

Suppose someone tells you that carrier pigeons, an extinct species, will return to an area if its habitat is restored. Is this statement accurate? Explain.