The main idea is usually in the first sentence of the essay or in the last paragraph. I believe that C is the correct answer. I hope this helped and feel free to thanks me, rate me 5/5 and make me brainliest!!!
Hemoglobin should be the answer to this question
Answer:
Red blood cells
Explanation:
Spleen is also called as graveyard of RBC
I would say the answer is C.
