5.it serves as body covering that provides protection to our body against microorganism temperature and acts as receptor for touch
a.integumentary system
b.digestive system
c.circulatory system
d.respiratory system

6.it is responsible for the exchange of gases such as carbon dioxide to oxygen in the bloodstream
a.integumentary system
b.digestive system
c.circulatory system
d.respiratory system

7.it is the transport system of the body responsible to the distribution of nutriens to the cells and carries away the waste
a.integumentary system
b.digestive system
c.circulatory system
d.respiratory system​