Given a scientific question, generate a correct answer to it.
--------
Question: What are the two main minerals found in ocean water?

Answer: sodium, chloride

Question: What type of experiment involves two identical experiments carried out side-by-side, with and without an independent variable?

Answer: controlled experiment

Question: What contain organelles common to other cells, such as a nucleus and mitochondria, and also have more specialized structures, including dendrites and axons?

Answer:
neurons