This is a substance used to identify the presence of protein. it is a blue solution that changes to pink-purple in the presence of proteins.

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the food storage products of chrysophytes are oils or the polysaccharide laminarin.   formerly classified as plants, the chrysophytes contain the photosynthetic pigments chlorophyll a and c all but the yellow-green algae also contain the carotenoid pigment fucoxanthin.

examples of nucleic acids are deoxyribonucleic acid (dna) and ribonucleic acid (rna).

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water, ice, acids, salts, plants, animals, and changes in temperature are all agents of weathering. weathering is the breaking down or dissolving of rocks and minerals on earths surface. once a rock has been broken down, a process called erosion transports the bits of rock and minerals away.