| 1. | Heterotrophs are organisms that grow using the carbon fixed by autotrophs.
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| 2. | :: Autotrophs form the basic root of the food chain.
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| 3. | The bottom of the pyramid represents the primary producers ( autotrophs ).
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| 4. | Autotrophs are fundamental to the food chains of all ecosystems in the world.
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| 5. | Overall, about 100 species are known to occur as autotrophs in lichens.
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| 6. | The Acidithiobacillia contain only sulfur-oxidising autotrophs.
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| 7. | All heterotrophs depend on autotrophs for their nutrition.
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| 8. | The terms can be used to describe energy transfer in both autotrophs and heterotrophs.
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| 9. | Trees have evolved many times here-did similar-looking autotrophs evolve elsewhere?
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| 10. | Autotrophs flow of energy and nutrients from a productive base of self-feeding autotrophs.
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