Question

Oxygen ENTERS the body through the...

1.The circulatory system
2.The Digestive system
3.The respiratory system
4. The cells in the body

Answer 1

Answer:
Oxygen enters the body thru the respiratory system
Step-by-step explanation:

Answer 2

Respiratory System

Step-by-step explanation:

It connects with the lungs. The oxygen enters the body through the capillaries which are a part of the respiratory system.