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In an adoptive-twin study, the focus is on studying the importance of

environmental factors.

Abiotic or biotic factors that have an impact on living things are collectively referred to as  ecological, eco or environmental factors. Abiotic elements include the outside temperature, the amount of sunlight, and the pH of the soil and water where an organism is found. The presence of rivals, predators, parasites, biological specialization, and food organisms are examples of biotic factors.

There are internal and external environmental influences in business and finance. There are factors in an organization's internal business environment that affect how commercial operations are approached and how well they succeed.

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