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7. Organisms that cannot produce their own food and obtain energy by consuming other organisms.
8. A type of autotroph that uses light energy to synthesize food, primarily through photosynthesis.
10. A group of bacteria that can photosynthesize and are often found in aquatic environments; they are sometimes referred to as blue-green algae.
11. An organism that primarily consumes plants.
13. Living components of an ecosystem, including plants, animals, fungi, and microorganisms.
14. Organisms that obtain energy by consuming other organisms. They can be classified into primary, secondary, and tertiary consumers.
15. An organism that primarily consumes other animals.
17. Referring to organisms that obtain energy by oxidizing inorganic substances, often found in environments like deep-sea vents.
18. Organisms, typically plants and algae, that produce their own food and serve as the base of the food chain.
19. An organism that consumes both plants and animals.
20. An organism that feeds on primary consumers, typically carnivores or omnivores.

1. Organisms, such as bacteria and fungi, that break down dead organic matter, recycling nutrients back into the ecosystem.
2. An organism that feeds directly on producers (e.g., herbivores).
3. An organism that obtains energy by oxidizing inorganic or organic compounds, rather than through photosynthesis.
4. Microscopic plants and algae that float in aquatic environments and are key producers in marine ecosystems.
5. Referring to organisms that convert light energy into chemical energy (food) using sunlight, primarily through the process of photosynthesis.
6. Organisms that can produce their own food through photosynthesis or chemosynthesis, using sunlight or inorganic chemicals.
9. An organism that feeds on dead organic matter, particularly decomposing plant and animal parts.
12. A community of living organisms interacting with each other and their physical environment.
16. Non-living components of an ecosystem, such as temperature, water, sunlight, soil, and air.