Which occurs as part of gas exchange?
oxygen is exhaled
carbon dioxide is inhaled
carbon dioxide diffuses from the trachea to blood in capillaries
oxygen diffuses from alveolar sacs to blood in capillaries

Option D

Explanation:

The oxygen is inhaled in the body by the nasal chamber and reaches into the lungs for the gaseous exchange. The gaseous exchange takes place by the exchange of oxygen and carbon dioxide.

The oxygen from the alveolar sac reaches to the blood capillaries and the carbon dioxide from the body is diffused into the lungs for purification.

heat a spark and oxygen

i think that c)gold was found there

but i am not sure