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Title: Explain why primary producers, especially those that undergo oxygenic photosynth Post by: colleen on Apr 11, 2012 Explain why primary producers, especially those that undergo oxygenic photosynthesis, are essential for life on Earth.
Title: Re: Explain why primary producers, especially those that undergo oxygenic photosynth Post by: bio_man on Apr 16, 2012 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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