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The difference in energy requirements of a motile species make photosynthesis an unsuitable form of primary energy generation for them. Since plants are sessile, their energy consumption rates are lower. Plants have approximate respiration:photosynthesis rates of 0.35-0.9, as can be seen in this table (click to enlarge): Once the energy consumption ...


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Why be mobile? To follow the sun? Plants are mobile. Their seeds are. We have plants living on other plants. Once they have a spot on the sun though moving does not necessarily improve your situation, being stationary and defending your territory though does. (Growing taller, deeper roots, wider crowns)


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There is at least one species of highly mobile animal that can photosynthesize, depending on your definition of "highly mobile": Sea Sheep? This Adorable Sea Slug Eats So Much Algae It Can Photosynthesize The catch is that this animal does not produce its own chloroplast.



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