Given a scientific question, generate a correct answer to it.
--------
Question: Which process helps absorptive protists absorb food molecules across their cell membranes?

Answer: diffusion

Question: The nervous system is characterized by electrical signals that are sent from one area to another. whether those areas are close or very far apart, the signal must travel along this?

Answer: axon

Question: In science, coefficients are used to balance what kind of equations?

Answer:
chemical