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| The subgroup of vertebrates. |
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| A flexible rod that supports the animals back. |
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| A connective tissue that is softer than bone but flexible and stronger. |
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| The singular form of the bones that make up the backbone of a vertabrae. |
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| An animal that doesn't produce much internal heat. (Reptile, Fish, and Amphibians. |
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| An animal whose body controls and regulates by controlling the internal heat it produces. (Mammal)Amphibians |
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| The outline of an object that is pressed into rock from many years of rock piling up on it. |
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| Hardened layers of sediments. |
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| A vertabrae that lives in water and has fins to propell it through the water. |
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| A sack in a fish's body that helps it swim to different depths. |
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| An ectothermic vertabrae that is born in the water and then a some other part of its life comes out of the water. |
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| The two upper chambers of a heart. |
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| The bottom chamber(s) of a heart. |
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| A specific enviroment that a specific species of a animal lives. |
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| An ectothermic vertebrate that has lungs and scaly skin. |
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| A internal storage tank in a bird. |
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| The muscular part of a stomach in a bird. |
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| A mammal that lays eggs.storage |
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| Mammals whose young are born alive, but at a early stage of development and usually continue to mature in a pouch on their mother. |
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Definition
| A mammal whose young develop in the mom's stomach until it can function on its own. |
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