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12 Cards in this Set
- Front
- Back
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• cell
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the basics unit of a living thing
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• tissue
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A group of similar cells that perform a spe-cific function is called a tissue.
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• organ
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Tissues may combine to form an organ.
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• adaptation
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Structures or behaviors that allow animals to per-form these basic functions in their environments are calledadaptations.
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• sexual reproduction
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is the process by which a new organism develops from the joining of two sex cells—a male sperm cell and a female egg cell.
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• fertilization
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The joining of an egg cell and a sperm cell is called fertilization.
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asexual reproduction
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is the process by which a single organ-ism produces a new organism identical to itself.
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• phylum
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Biologists have classi-d animals into about 35 major groups.
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• invertebrate
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animals without backbones.
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vertebrate
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animals with a backbone.
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• bilateral symmetry
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if there is just one linethat divides it into halves that are mirror images.
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radial symmetry
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have many lines of symmetry
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