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| The main bone, made up of many small bones joined together, that runs along the back in some animals. |
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| Animals without backbones make up most of the animals in the world. |
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Definition
Examples:
Jellyfish, worms, snails and sponges |
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| A hard outer covering that supports and protects some animals without backbones. |
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| To shed an animal's outer covering. |
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| six legs, a head, thorax and abdomen. |
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| To sort into groups by similarities and differences. |
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| Organs for breathing found in fish and amphibians. |
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| One of a large groups of animals with backbones that live part of their lives in water and part on land. |
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| An animal with a backbone that has a dry, scaly skin. They are cold-blooded. |
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| Animals with backbones, a pair of wings, a pair of feet and feathers. They are warm-blooded. |
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| An animal is said to be warm-blooded if its body temperature remains the same even if the temperature of the air around them changes. |
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| An animal is cold-blooded if its body temperature changes with the air temperature around it. |
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| An animal with a backbone that usually has hair on its body and feeds milk to its young. |
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| The way a living thing acts. |
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| A behavior that an animal is born with and does not need to learn. |
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| A simple automatic behavior. |
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| A behavior caused by a stimulus. |
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| All the living and non-living things in an environment and how they interact. |
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| A place where an animal or a plant lives. |
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