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| The branch of psychology that studies the patterns of growth and change that occur throughout life. |
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| The issue of the degree to which environment and heredity influence behavior. |
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| Twins who are genetically identical. |
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| A research method that compares people of different ages at the same point in time. |
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| A research method that investigates behavior as participants age. |
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| A research method that combines cross-sectional and longitudinal research by considering a number of different age groups and examining them at several points in time. |
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| Rod-shaped structures that contain all basic hereditary information. |
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| Rod-shaped structures that contain all basic hereditary information. |
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| The parts of the chromosomes through which genetic information is transmitted. |
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| The new cell formed by the union of an egg and sperm. |
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| The new cell formed by the union of an egg and sperm. |
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| A developed zygote that has a heart, a brain, and other organs. |
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| A developing individual from eight weeks after conception until birth. |
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| The point at which a fetus can survive if born prematurely. |
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| Environmental agents such as a drug, chemical, virus, or other factor that produce a birth defect. |
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| Unlearned, involuntary responses that occur automatically in the presence of certain stimuli. |
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