instruction:
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:
When sparks from a steel grinder react with oxygen, what do they form?
answer:
iron oxide

question:
What is the phenomenon in which light and sound waves become circular at the point source of a barrier?
answer:
diffraction