Sentence outlines tend to help with grammar. They help you organize clauses to figure out internal punctuation such as commas or semicolons. They also help you make sure you have a completed thought.
An antonym would be "Crucial"
Homes on East Egg are wealthy from long lines of generations (a son will inherit his father's fortune), whilst homes on West Egg are people who built up their fortunes (ex. people who gain money from working in industries).
They are examples of evidence