while elements and compounds can both be classified as pure substances because they have distinct properties and composition, cannot be decomposed further.

elements

Explanation:-

Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions. Example: Cobalt

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water

Thus element is the pure substance that cannot be decomposed further.

away from the curb

explanation:

the wheels would then hit the curb if it started to rolling, decreasing the chance of an accident.