B.) Inversion.
I'm not quite sure, so might wanna double check, but I think that's correct. Hope I helped, if not I apologize.
Answer:
It is called Phagocytosis
Explanation:
I think the correct answer from the choices listed above is the last option. The control group to be used to test the hypothesis would be the swallows with average-length tails. A control group <span>is defined as the </span>group<span> in an experiment or study that does not receive treatment by the researchers.</span>
