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colleen colleen
wrote...
Valued Member
Posts: 17076
12 years ago
Explain why primary producers, especially those that undergo oxygenic photosynthesis, are essential for life on Earth.
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wrote...
Educator
12 years ago
a theme should be how oxygen must be cycled back into a usable form for aerobes by organisms that evolve oxygen during photosynthesis as long as aerobic organisms continually use up gaseous oxygen.
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