Grade 8 Bilingual - The carbon cycle

4. Substances that provide nourishment essential for growth and the maintenance of life.
5. Organic compounds, such as sugars and starches, that provide energy to living organisms.
6. The process of burning something, which releases energy and carbon dioxide.
9. The series of processes by which carbon compounds are interconverted in the environment.
12. A biological community of interacting organisms and their physical environment.
13. Organisms that break down dead or decaying organisms, recycling nutrients back into the ecosystem.

1. Large molecules composed of amino acids essential for the structure, function, and regulation of the body's tissues and organs.
2. The process by which green plants use sunlight to synthesize foods from carbon dioxide and water.
3. The process of inhaling oxygen and exhaling carbon dioxide; also refers to cellular respiration, where cells produce energy from nutrients.
6. A fundamental non-metal element crucial for all life forms; exists naturally in forms such as diamonds and graphite.
7. A type of nutrient that provides energy and supports cell growth.
8. Natural fuels such as coal, oil, and natural gas formed from the remains of ancient organisms.
10. A substance formed from two or more elements chemically united in fixed proportions.
11. The basic unit of a chemical element, consisting of a nucleus surrounded by electrons.