Answer: Hi I have the answer to your problem!
Explanation:
Cardiovascular exercise is any vigorous activity that increases heart rate and respiration and raises oxygen and blood flow throughout the body while using large muscle groups of the body repetitively and rhythmically. So your answer is A.
Black stuff from volcanos!
A and b are cells so they definitely are not bacterium so c and d are bacterium I think. Your welcom.
Answer:
No
Explanation:
No, your body functions into the oxygen from trees. Oxygen is the only way for your blood to keep your body warm. If you dont have enough blood in your body for the oxygen it needs, then your body will keep frozen. Oxygen is the only way to make your body prosses.