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By studying changes between stages of development, we can also find the continuity between stages.

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More than just Psychologists study life-span development. Anthropoligists, sociologists, neurologists, and other fields of study also add to the field.

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We as humans develop "from the womb to the tomb," and learning something about one period of growth can teach us about other periods.

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Changes in these are examined by developmental psychologists.

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Neither genes nor environment can completely control our behaviors and it is cannot yet be certain which influences us more.

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Our culture and social interactions influence the way we act and react to the people and stimulus around us.

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Genes influence our biological reactions to our environment.

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Aaaaand that's the general idea behind research on development involving twins. On to genes and environment, and their roles in human growth!

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If neither Twin A nor B exhibit super human abilities like flight and super strength, but if both Twins C and D do, it may show that super human tendencies are genetic, not as much environmentally affected.

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Twins A and B both grew up only speaking English. Twin C only grew up speaking English and Twin D was taught English and Portuguese from infancy. If Twins A and B show no difference in their ability to learn other languages easily but Twin D picks up other languages faster than Twin C, it could be an indicator that language learning abilities are environmentally influenced.

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Both sets of twins have the same color eyes and hair, so it is likely that hair and eye color is determined by genetics.

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Twins C and D were separated at birth and live in different environments.

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They are raised in the same environment

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What role do twins play in the study of human growth?

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What role do twins play in the study of human growth?

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Ah, the classic Nature vs. Nurture. Which has a greater effect on human development, environment or genetics? Because twins share DNA, they are ideal for studying this very subject. If identical twins are placed in different environments but have similar traits, we can likely attribute that to genetics, especially when compared and contrasted with twins raised in the exact same environment. Here is a (slightly silly) mock-example.