I would say 4. To create a hypothesis, you would need some knowledge about what you're studying. This is where prior knowledge could come in handy.
Answer:
(sorry if im incorrect)
D
an organ, a level of organization that is higher than an organelle
Explanation:
So levels of structures goes :
atom, molecule, organelle, cell, tissue, organ, organ system, organism
D. Muscus and cilia trap pathogens
have a good day!
I don’t know if this is a question but yes a controlled experiment allows you to isolate and test the hypothesis
