Based on their animal and plant life, biomes are broken into smaller, local communities called
a. droughts
b. ecosystems
c. species
d. climates

b. ecosystems

Explanation:

Biome is a community of living beings living in a common environment. The biome consists of many ecosystem. These biomes can be found in wide range of continents. An ecosystem is a biotic community in which the living beings interact with the non-living factors such as air, water,soil, sunlight present in the environment. The living and non-living factors of the biome may vary.

A large biome is broken down into small living community of living beings interacting with the non-living physical environment that is ecosystem.  

answer; bodies of water store heat during the day and release it at