Biology 11th Edition by Cecie Starr ,Ralph Taggart

تمرين 6

Only about eight classes of pigment molecules are known, but this limited group gets around in the world. For example, photoautotrophs make carotenoids, which move through food webs, as when tiny aquatic snails graze on green algae and then flamingos eat the snails. Flamingos modify the ingested carotenoids. Their cells split beta-carotene to form two molecules of vitamin A. This vitamin is the precursor of retinol, a visual pigment that transduces light into electric signals in eyes. Beta-carotene gets dissolved in fat reservoirs under the skin. Cells that give rise to bright pink feathers take it up.
Select a similar organism and do some research to identify sources for pigments that color its surfaces.