3. What gas leaves the lungs during exhalation?
A. carbon dioxide B. oxygen C. blood D. water
4. What is the process by which deoxygenated blood returns to the heart for purification?
A. pulmonary circulation
B. coronary circulation
C. systemic circulation
D. deoxygenated
Answers & Comments
Answer:
d po deoxygenated yan lang kasi alam ko yan din sagot ko
Answer:
3. A
4.A
Explanation: