Answer:
B. system
Explanation:
An example of a system would be the circulatory system helps circulate blood carrying nutrients to organs and waste material away from organs. It includes the organs - heart, blood vessels and lungs.
Keep soft objects,loose bedding
A phobia is an irrational fear of something that's unlikely to cause harm. The word itself comes from the Greek word phobos, which means fear or horror
Sickle red blood cells can block the blood vessels in the lungs. This reduces oxygen flow to the lungs and can make it hard to breathe. This condition is an emergency and may be life-threatening.
