Phytoplankton
Phytoplankton has existed on Earth for approximately 750 million years and has remained essentially unchanged. Phytoplankton is the earliest known source of vitamin D in evolutionary history, producing it through sunlight exposure.
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Phytoplankton has existed on Earth for approximately 750 million years and has remained essentially unchanged. Phytoplankton is the earliest known source of vitamin D in evolutionary history, producing it through sunlight exposure.