What we can say, however, is that all animals, from jellyfish to man, share a particular molecule--rhodopsin--which is responsible for starting the process of converting light into the electrical signals that the nervous system can make use of. Plants, fungi, and even bacteria also have light receptive molecules, but none resemble animal rhodopsin, and we can assume from this rhodopsin evolved at much the same time as multicellular animal life. Rhodopsin is a two-part molecule.

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