The part of the experiment that is standard for comparison is the control. A control group is used to compare your evaluations to - they aren't exposed/involved with the experiment
Most closely related to the Otariidae
A seems like the best answer, since your lungs expand while you breath it makes sense that the diaphragm would expand.
I know that one of them is respiratory system.....
Answer:
Cancer is unchecked cell growth. Mutations in genes can cause cancer by accelerating cell division rates or inhibiting normal controls on the system, such as cell cycle arrest or programmed cell death. As a mass of cancerous cells grows, it can develop into a tumor.