There are several polymers in living beings, for example, proteins, DNA, RNA, and polysaccharides.
No, not all polymers are man-made. Some polymers can be found in nature, such as proteins, cellulose, and DNA. These natural polymers have unique properties and functions in living organisms.
Plastics, which are polymers plus some additives, are their main use.
Molecules
Some examples of polymers found in carbohydrates include starch, cellulose, and glycogen. These polymers are made up of repeating units of simple sugars like glucose.
Yes. Some polymers have double bonds, for example natural rubber - poly isoprene . See link for structure. However many polymers that are familiar do not polyethylene is (C2H4)n , polyvinyl chloride (C2H3Cl)n
Plants do make and use some polymers (e.g. starch, cellulose etc.), as do some animals (e.g. spider silk) but most of what we know as polymers are artificial (e.g. polyethylene, nylon etc.).
Such a river would be still in the form as it was produced exclusively by nature. Now days it would be impossible to find a river without any form of interference from man.
Auxins is the name of the acid produced by some plant roots.
Macromolecules are polymers. There are bio-polymers such as carbohydrates, proteins, lipids and DNA, and there are synthetic polymers such as plastics (polystyrene and polyvinylchloride) and synthetic fibres. Nylon and terylene are also considered macromolecules.
Elements do not contain polymers. It is the other way around. Organic polymers contain elements. These are usually C, O, H, N, Halogens and some others.
Polymers can be both depending upon which ones you are asking about. Polymer simply means "a chain of identical molecules linked together". Nonrenewable polymers would be plastics made from crude oil; renewable polymers would be cellulose and lignin in tree trunks.
Protein.