When you breath oxygen enters your body and gets transported to your blood cells
Answer:
The color of the birdfeeders
Explanation:
Independent variable is the variable in the experiment that is changed, so the only thing changed in this experiment is the colors of the bird feeders
its d because if you get rid of trees then your gettign rid of homes and its increses soil erosion from there being no roots of trees decresed biodiversty form the lack of homes and decresed quality of air because theres no trees to make oxygen
Gravitational potential energy
