this is true! someone can have it and not have any presentable symptoms
The respiratory system can be damaged from smoke inhalation and tar buildup from the chemicals used in tobacco, which can also harm the heart and blood vessels. Two conditions that can be caused from smoking are Heart Disease and Lung Cancer.
Answer:
d
Explanation:
The uterus is part of the female reproductive system. The purpose of the uterus is to hold a fetus during gestation.
The nervous system in one's body sends signals to the muscles to contract in order to move or perform a task like walking. The respiratory system sends oxygen to the muscles in order to provide energy for those actions
It usually depends on your schedule if your busy and work late I'd say 7-10 hrs but if you are a normal average person 8 hrs will do the trick
