What criterion must a statement meet to be used as a scientific hypothesis

In the respiration-photosynthesis cycle shown above, what are the products of cellular respiration that belong in box 2?

Drag each tile to the correct box. the body monitors the levels of oxygen in the blood to regulate breathing. isabel is running in a marathon and is near the finish line. she feels out of breath. how will her nervous system work to generate a reaction? arrange the tiles in chronological order. isabel's breathing rate increases. sensory receptors in the arteries detect low oxygen levels. the brain sends signals through motor neurons. sensory neurons generate an impulse. the central nervous system relays an impulse to certain brain regions.

Has anyone taken the genetics unit test in connexus? not looking for answers, just a little bit what to expect and some with studying.