Photosynthesis powers roughly what share of Earth's ecosystems?
A19 percent
B49 percent
C79 percent
D99 percent
Answer & Solution
Correct answer: D. 99 percent
1. Almost every food chain starts with an organism that fixes carbon using light.
2. A wolf that eats a deer is at the end of a path that began with sunlight and photosynthesis.
3. Photosynthesis powers 99 percent of Earth's ecosystems.
4. Chemoautotroph-based ecosystems account for the small remainder.
_Source: OpenStax Biology for AP(R) Courses (CC BY 4.0), Ch 8 'Photosynthesis', sections 8.1-8.3_
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