AP Environmental Scienceeasymcq1 pt
The greatest source of energy for Earth's ecosystems is
A.the sun
B.geothermal vents
C.lightning
D.the moon
Explanation
Core Concept
Nearly all ecosystems run on solar energy fixed by photosynthesis; only deep-sea vents and a few chemosynthetic systems run on Earth's internal heat.
Correct Answer
Athe sun
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