An experiment is performed on trees to see how different liquids affect growth. Each tree in the experiment is given a different type of liquid; water, vegetable oil, or coca cola.
Each plant has the same amount of soil, the same amount of sunlight, and the same
amount of liquid. In this investigation, what is the independent variable (IV)?

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.