Biology answer to the assignment, Assignments of Biology

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Across:

2. A lining covering the lungs and chest cavity, consisting of two layers separated by fluid.
3. Cellular structure in plants and some organisms for storing substances and maintaining cell shape.
4. A muscle beneath the lungs, adjusting chest volume during breathing.
5. A muscular tube connecting the nose, mouth, and throat to the esophagus and windpipe.
6. Microscopic blood vessels linking arteries and veins, facilitating nutrient exchange.
7. Microscopic sacs in the lungs for oxygen and carbon dioxide exchange.
8. Air-filled cavities in the skull, lightening its weight and affecting voice resonance.
9. Respiratory organs in aquatic creatures, extracting oxygen from water. Down:
10. The airway linking the larynx to the lungs, enabling air flow.
11. Small air passages branching from the bronchi, leading to lung air sacs.
12. Tiny openings on plant surfaces, allowing gas exchange.
13. Openings in the bodies of insects, enabling air exchange.