Answer :
As in all experiments one must use the scientific method... One of the conditions during experimentation is the use of a control for the subject. You should have several fruitflies exposed to radiation while other not (this would be your control)
The behavior can be said to be innate because the stimulus elicits a random response.
What is a behavior?
It should be noted that a behavior simply means the trait that is exhibited by an individual or an organism.
In this case, since the group of flies that had been exposed to radiation no longer exhibit geotaxis, this shows that behavior is innate and not learned because the stimulus elicits a random response.
Learn more about behavior on:
https://brainly.com/question/24518056