Passive transport can be explained by which statement?
Particles move randomly.
Energy is used to move particles.
Large particles can move into cells.
Particles are moved to areas of higher
concentration.
DONE

i believe the correct answer from the choices listed above is the first option. the scientists need to look at the   validity of data, claims, hypotheses, and observations before  developing an argument. they base their arguments on facts that are present and they make sure they have proofs. 

explanation:

i believe it is "they are not used up by reactions" as the answer to your question, text me back if this is correct because i just learned this.

friedrich meischer discovered it in white blood cell