The amount of light. He is testing the effects of light, which implies there will be different amounts of light tested to reach a conclusion.
Answer:
The circulatory and respiratory systems work together to pump blood and oxygen throughout the body. Air moves in and out of the lungs through the trachea, bronchi, and the bronchioles. Blood moves in and out of the lungs through the pulmonary arteries and veins that connect to the heart and thats how it works.
Explanation:
Answer:
cell
Explanation:
cell constist of nucleus and other organelles