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| basic unit of structure and function in living things |
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| a group of similar cells that perform a special function |
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| a group of several different tissues |
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| structures or behaviors that allow animals to survive and/or reproduce in their environment |
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| the process in which a new organism develops from the joining of two sex cells, a male sperm and a female egg |
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| the joining of an egg cell and a sperm cell |
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| the process by which a single organism produces a new organism identical to itself |
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| 35 major groups that biologists classify animals into based on relation to other animals, body structure, development, and DNA |
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| animals without a backbone |
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| What is the order of structure in animal systems? |
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Definition
| The cells of most animals are classified into higher levels of structure, including cells, tissues, organs, and systems. |
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| What are the four major functions of animals? |
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Definition
| They are to obtain food and oxygen, keep internal conditions stable, move, and reproduce. |
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| How are animals classified? |
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Definition
| Animals are classified according to how they are related to other animals. These relationships are determined by an animal's body structure, the way an animal develops, and its DNA. |
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| What is the system for classifying animals? |
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Definition
Kingdom
Phylum
Class
Order
Family
Genus
Species |
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