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Common Diseases in Human Beings › ViewFollowing are the causes that weaken the immune system except
A. Stress
B. Exposure to polluted air
C. Exposure to pesticides
D. Healthy diet
Tissues › View
When we observe the lower surface of a leaf through a magnifying lens we see numerous small openings. Which of the following is the term given to such openings?
A. Stomata
B. Lamina
C. Midrib
D. Veins