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Fossils 3

Period Animal with a backbone.
Comet Unit of geologic time into which geologists divide eras.
Invertebrate Collection of ice and dust that orbits the sun, typically in a long, narrow orbit.
Vertebrate Many types of living thing become extinct at the same time.
Amphibian Vertebrate, body temperature is regular by its internal heat it have his sking coverd with hear or fur and glands that produce milke to feed its young.
Reptile Animal without a backbone.
Mass extinction Vertebrate whose temperature is determined by the temperature of its environment, that has lung and scaly skin, ant lays eggs on land.
Mammal Vertebrate whose body temperature is determining by the temperature of its environment.

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