How does the amount of precipitation affect the tundra and tropical rain forest species

As the human population grows, what happens to our natural-resource requirements? o they increase o they decrease o they do not change. they go in cycles

When does the circulatory system work with the respiratory system? a. during blood cell formation b. during cellular respiration c. during intestinal digestion d. during a viral infection

When a person is exercising the body needs to deliver increased amounts of oxygen to the muscles which component of blood ensures that the muscles will receive it