Stars on the upper left end of the main sequence differ from those on the lower right end in what way?

On the main sequence, stars in the upper left are hotter and brighter than stars in the lower right. Main-sequence stars that are hotter and brighter are generally more massive, so the upper-left stars are more massive. The lower-right stars are cooler, dimmer, and less massive.

AI-written and checked against the verified answer.