When scientists are doing research to determine how the environment affects a life form, it often takes many years to reach a conclusion. why do you think that is the case?
a. many environmental factors must be considered (water, light, and temperature were just three that were investigated in this simulation).
b. many tests must be performed because variables need to be tested one at a time (first test for water effects, then test for light effects,
c. some effects take a long time to become noticed, so the experiments often have to take place over long periods of time.
d. all of the above.

The correct answer is option D, that is, all of the above.

Explanation:

While performing an experiment to find the effects of the environment on a life form there is a need to consider a lot of factors as many factors in tandem can affect the species in a mentioned scenario. While testing some of the variables would not be seemed obvious at first instance, therefore, in the first look or test, the outcomes are generally inconclusive. At the same time, there is a need for each of the variables to be tested carefully, and also some of the variables may consume more time in order to sound conclusive.

the speed increase from w to x due to increased gravity force

the speed decreases from x to y due to decrease in gravity

sorry, but you do not have posted the diagram.