Final answer:
The claim that biomes have sharp boundaries is false; biomes often transition gradually into one another with areas of overlap known as ecotones.
Step-by-step explanation:
Biomes are not uniform entities with sharp boundaries. Instead, the transition between different biomes is often gradual, which is known as ecotones. These transitional areas can show characteristics of both adjoining biomes. Therefore, the answer to the question is B) False.
Biomes are distinct biological communities that have formed in response to a shared physical climate. For example, tropical rainforests, savannas, and subtropical deserts are all biomes classified based on such factors. Each biome can occur in geographically distinct areas if those areas share similar climates, indicating the importance of abiotic factors in their distribution.