Question

which statements describes primary producers? *
make their own food using the energy of sunligh
all take in energy - rich compounds that were made by other organisms.
all make their own food using the energy of compounds in the environment.
make energy - rich compounds that can be used by other organisms.

Explanation:

1. Analyze the first option: Primary producers (like plants) perform photosynthesis, using sunlight to make their own food (glucose), so this is correct.
2. Analyze the second option: Organisms that take in energy - rich compounds made by others are consumers (like animals), not primary producers, so this is incorrect.
3. Analyze the third option: While some primary producers (like chemosynthetic bacteria) use energy from inorganic compounds, not all primary producers rely on compounds in the environment in this way, and the "all" makes this statement too broad. Also, the main way for most primary producers (plants) is using sunlight, so this is incorrect.
4. Analyze the fourth option: Primary producers (e.g., plants) make organic compounds (like glucose) through photosynthesis (or chemosynthesis), and these compounds can be used as an energy source by other organisms (consumers, decomposers), so this is correct.

Answer:

• make their own food using the energy of sunlight
• make energy - rich compounds that can be used by other organisms