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2. – A muscle that helps in the breathing process by contracting and relaxing.
5. – The process of breaking down glucose to produce energy, releasing carbon dioxide and water as byproducts.
6. – The windpipe that connects the mouth and nose to the lungs, allowing air passage.
8. – The organelle in plant cells where photosynthesis occurs.
9. – A protein in red blood cells that binds to oxygen and transports it throughout the body.
10. – Tiny air sacs in the lungs where oxygen and carbon dioxide are exchanged with the blood.
12. – A gas required by animals for cellular respiration and released by plants during photosynthesis.

1. – Small openings on plant leaves that allow gas exchange to occur.
3. – The process by which plants use sunlight, carbon dioxide, and water to produce oxygen and glucose.
4. – Tiny hair-like structures in the respiratory tract that help remove dust and mucus.
7. Dioxide – A gas taken in by plants for photosynthesis and released by animals during respiration.
11. – The primary respiratory organs in mammals that facilitate the exchange of oxygen and carbon dioxide.