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Algae on greenhouse walls
"Wendy" wrote in message news:sB23b.69617$kP.25605@fed1read03...
Just another thought on algae..........It is alive & growing, so it's using up the oxygen that the plants need? Yes? Cheers Wendy No. Plants use CO2 and give off oxygen as a waste product. Most of the oxygen presently on earth is the product of plant metabolism. (mostly by marine plankton) Before oxygenating organisms evolved, Earth's atmosphere was probably devoid of free oxygen. J. Del Col |
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