Primary producers fix phosphorus into biologically useful molecules just like they fix carbon and, in some cases, nitrogen.

Question

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Primary producers, such as plants and algae, do fix carbon through photosynthesis, but they do not fix phosphorus or nitrogen in the same way. Phosphorus is taken up from the environment in its inorganic form and used directly, while nitrogen fixation is a process carried out by specific bacteria that convert atmospheric nitrogen into a form usable by plants.

Primary Producers Fix Phosphorus into Biologically Useful Molecules Just Like