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1. Algae, mosses, and ferns are examples of autotrophs.
2. Autotrophs are organisms that can produce their own food through photosynthesis, using sunlight, water, and carbon dioxide to create energy in the form of glucose.
3. Algae, mosses, and ferns are all photosynthetic plants that can make their own food, hence they are classified as autotrophs.
4. These organisms play a vital role in the ecosystem by converting sunlight into chemical energy, which serves as a primary energy source for other organisms in the food chain.
Therefore, the correct answer to the question is:
a) autotrophs
