What are polymers? how are polymers classified based on their source?

A polymer is often known as very large molecules. They don't just have random molecules in them, they have synthetic and natural molecules.

Polymers are classified by source in many ways. You have natural polymers, which are in nature or come from other natural polymers, Synthetic polymers via humans or the inside of a paper package. Lastly there are Semi-Synthetic polymers, which are made mostly in the lab.

astronomers such as edwin hubble.

in chemistry, adhesion and cohesion are attractive forces that exist between molecules. they hold the molecules together from each other. they are different in that adhesive force exists between molecules of different substance while cohesive force happens between molecules of same substance.

adhesion between water and glass causes water molecules at the edge of water and glass interface to climb up the wall in a narrow glass tube. this is called capillary action. cohesion is what gives glass its shape and causes water to form a droplet.