In which parts of plants or animals are proteins especially common? a. the soft, fleshy parts of fruits b. skin, hair, nails, and muscles c. tissues that store fat d. tough plant tissues, such as wood

This chart lists four kinds of polymers and their sources. what can be known about all four polymers, despite their differences? they come from living things. they share ionic carbon bonds. they are at least 100 monomers long. they are made of repeating subunits.