Science

3. Dioxide* Waste gas removed from the body during respiration.
5. Tiny air sacs in the lungs where gas exchange occurs.
7. The continuous movement of blood throughout the body to deliver nutrients and oxygen.
8. Enzyme that catalyzes the first step of the Calvin cycle, fixing carbon dioxide into an organic molecule.
10. Habit that significantly damages lung function and increases heart disease risk.
12. Phase of photosynthesis that converts light energy into chemical energy, producing ATP and NADPH.
13. Fluid-filled space in chloroplasts where the light-independent reactions take place.
15. Selection* Process by which traits that enhance survival and reproduction become more common in a population.
17. The variety of life in an ecosystem, which is crucial for resilience and adaptation.

1. Membrane-bound structures within chloroplasts where the light-dependent reactions occur.
2. Inheritance pattern where both alleles in a heterozygote are fully expressed.
4. Also known as the Calvin cycle; phase where carbon dioxide is fixed into glucose using ATP and NADPH.
5. The process of splitting water molecules during the light-dependent reactions to release oxygen.
6. Dominance* Inheritance where the phenotype of heterozygotes is a blend of both alleles.
7. Organelles in plant cells where photosynthesis occurs.
9. Molecule that carries high-energy electrons from the light-dependent reactions to the light-independent.
11. Term used for species at risk of extinction due to habitat loss, hunting, or other factors.
12. Essential gas transported by the blood to cells for respiration.
14. Cycle* Another name for the light-independent phase of photosynthesis where glucose is synthesized.
16. Major air passages that branch from the trachea to the lungs.