Answer:
Exercise causes the heart to pump blood into the circulation more efficiently as a result of more forceful and efficient myocardial contractions, increased perfusion of tissues and organs with blood, and increased oxygen delivery.
Explanation:
Answer:crop rotation efficient irrigation systems minimal use of fertilizers soil and water conservation
Oxygen, water, some type of resources to build, and food to eat
We eat and drink to obtain the energy and matter we use to survive