Select the correct answer. Which describes a characteristic of branched polymers?

A.
They have only one start point and many end points.
B.
They have many start points as well as many end points.
C.
They have many start points and only one end point. Respiration involves the release of energy due to the breakdown of large polymers. What type of a reaction is respiration?

coal is not sustainable because it will one day run out.

explanation:

on disadvantage of hydroelectric power is the cost. another disadvantage of using hydroelectric power is finding a water source powerful enough to harvest hydroelectric power.

when atoms of different types of elements join together, they make molecules called compounds. water consists of compound molecules made up of 2 hydrogen atoms and 1 oxygen atom. this is why it's called h2o. water will always have 2 times the number of hydrogen atoms as oxygen atoms.