Question

how are the things needed for cellular respiration transported to the cells?
through the respiratory system
through the digestive system
through the blood stream
rewatch

Explanation:

Cellular respiration requires glucose (from digestion) and oxygen (from respiration). These are transported via the bloodstream. The respiratory system brings in oxygen, the digestive system breaks down food into glucose. Both oxygen and glucose enter the blood. Blood then circulates, delivering them to cells for cellular respiration.

Answer:

Through the blood stream