Hans G. Schantz on Gab: "TIL the Purple Earth Hypothesis proposes that the Earth's surface biosphere may have appeared purple in the past due to photosynthesis at the time being based o..."

Hans G. Schantz on Gab: "TIL the Purple Earth Hypothesis proposes that the Earth's surface biosphere may have appeared purple in the past due to photosynthesis at the time being based o..."