They are also known as more-developed countries.
They are home to 70 percent of the world's population.
two-thirds of the people live in cities and earn their income from industry.
A two-column proof contains a table with a logical series
of statements and reasons that reach a conclusion. It is commonly present
in geometry. Two column proofs always have two columns: statements and reasons.
The other choices don’t fit in the definition of two column proof.