Question

how did nasa help to distinguish genetic factors from environmental ones when studying the effects of living space? (1 point)
by introducing animals and other organisms that could be studied 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 running experiments on astronauts that were in space for over a year.

Explanation:

Twins share nearly identical genetic material, so comparing one twin on Earth (control, constant environment) and the other in space (variable environment) isolates the environmental effects of living in space from genetic factors. Other options do not directly control for genetic variables to distinguish the two factors.

Answer:

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