NASA helped to distinguish genetic factors from environmental ones when studying the effects of living space primarily by analyzing changes in one twin on Earth and the other in space. This approach allowed researchers to compare the effects of the space environment on a genetically identical pair, thereby isolating the influence of genetics from environmental factors.
How did NASA help to distinguish genetic factors from environmental ones when studying the effects of living space? (1 point)
• By observing changes in retired astronauts over a period of ten years.
• By running experiments on astronauts that were in space for over a year.
• By analyzing changes in one twin on Earth and the other in space.
• By introducing animals and other organisms that could be studied in space.
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