Given a scientific question and its correct answer, generate supporting facts for the answer. This supporting fact can be an explanation for the answer to the given question.

Question: Name the organ located behind the nasal cavity in which both food and air pass through? Answer: pharynx
Behind the nasal cavity, air passes through the pharynx , a long tube. Both food and air pass through the pharynx.

Question: Many transition metals and their compounds are used as what? Answer: catalysts
Many transition metals and their compounds are used as catalysts. Given MnO 2, FeCl3, Pt, and Ni, which would you select for each purpose and why?.

Question: What do ocean mollusks use to absorb oxygen from the water? Answer: gills
Most ocean mollusks have a gill or gills to absorb oxygen from the water.