Question

How did NASA help to distinguish genetic factors from environmental ones when studying the effects of living space?(1 point)
Responses

By analyzing changes in one twin on Earth and the other in space.
By analyzing changes in one twin on Earth and the other in space.

By observing changes in retired astronauts over a period of ten years.
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 running experiments on astronauts that were in space for over a year.

By introducing animals and other organisms that could be studied in space.

Answer 1

By analyzing changes in one twin on Earth and the other in space — comparing identical twins lets researchers hold genetics constant so observed differences are due to the space environment.