How are biomes related to ecosystems?

An ecosystem exists within a biome. Biomes are home to many species of animals, which interact with one another to create an ecosystem.

Explanation:

An ecosystem is defined as "the interaction of plants and animals with nonliving things and each other." A biome is defined as "a large region of the world that has similar plants, animals and other organisms that are adapted to the terrain and weather of that region."