The food we eat since the most of our shellfish requires calcium.
Photosynthesis is performed in the chloroplasts.
Answer:A
Explanation:
Sunlight is the ultimate source of energy on the earth.
Because the lung has two bronchi, it can still function if one bronchus is blocked by a foreign object. No gas exchange will happen to the affected side, and the other lung will compensate for the loss of air. The blocked portion though can become inflamed and can lead to infection and damage.
