Sentence C as there is no punctuation separating the two clauses.
Explanation:
Amoeba depends on simple diffusion of gases from breathing. The exchange of gases in Amoeba takes place through its cell membrane.
<span>If you have been sick with diarrhea, the answer that the health department would accept is this: The diarrhea has been gone for almost two days, so now you can go back to working with food. Once you will be healed, then you can go back to you normal diet.</span>
<span>B. CONCEDE is your answer. Hope it helps.</span>
