Having remarkable energy, liveliness, or force of personality:<span>a vital leader.</span>
It reflects what people did in the 1860 and 1900s talking about what they did to live
Involving the condition that a group of quantities connected by operators gives the same result whatever the order of quantities involved.
The first step in the five step process for problem-solving is to recognize that the problem exists
D. Dad
In this sentence, dad is being used as a name or proper noun. It needs to be capitalized.