The main function of the excretory system is to eliminate from the body.

a.
disease
b.
energy
c.
waste
d.
oxygen

C: waste.

Explanation:

I think you are in the wrong section. But the answer is

C: Waste.

A: Disease is mostly fought by the neutrophils, a type of white blood cell that's a warrior when it comes to fighting disease.

B: energy. I'm not exactly sure who provides the energy. The first step is the digestive system.

D: Oxygen is again a blood thing. The hemoglobin caries oxygen to various parts of the body.

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