Questions about example sentences with, and the definition and usage of "Sparse"

A: scattered or dispersed

A: "The population of this region is sparse and slow."
"The old man's yard has a very sparse growth of grass."
"The woman decided she needed to go grocery shopping because her food supply was sparse."
"The man decided to shave his head because he only had a sparse amount of hair."
"The soldiers soon became used to only surviving on sparse amounts of supplies when in the battlefield."

A: This region is thickly forested, but vegetation becomes sparse higher up in the mountains.

In the US, the population is concentrated on the coasts; the central states are more sparsely populated.

A: His house is sparsely decorated and he doesn’t have a lot of furniture.

I ordered a pizza but the pepperoni toppings were sparse and there weren’t any olives.

A: Sparse is spread out. Example: the times he read a book were sparse. Rare is uncommon or unusual. Example: It is rare to have green eyes. Lack means not have. Example: He lacks a reason to learn a language.