Answer:
D.
Explanation:
The respiratory system is responsible for breathing—that includes oxygen.
Answer:The amount of calcium you need every day depends on your age and sex.
Explanation:WOMEN
Age 50 & younger 1,000 mg* daily
Age 51 & older 1,200 mg* daily
MEN
Age 70 & younger 1,000 mg* daily
Age 71 & older 1,200 mg* daily
The answer is D because everyone benefits from physical activity.
Small Intestine, mainly Jejunum and Ileum
The answer should be true because in either way both are releasing CO2 back into the air which does harm the atmosphere.