Adesert with a hot, dry climate is an example of

Biome

Explanation:

"A biome is a distinct climate zone. A desert with a hot, dry climate is an example of a biome.

A population is a group of organisms from the same species in the same area. A herd of cattle is an example of a population.

A community is made up of different populations that interact with each other. A pod of dolphins hunting and feeding on a school of fish is an example of a community interaction.

An ecosystem consists of all the living organisms in an area and their physical environment. All of the living organisms in a forest plus their physical environment is an example of an ecosystem."

if you listed your answers right then i believe your answer is b.