The true statement is:
An ecosystem consists of living things that interact in the same environment.
Here's a brief explanation of why the other statements are not correct or accurate:
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Biomes contain thousands of ecosystems and provide ecosystem services. (While biomes do consist of multiple ecosystems and can provide ecosystem services, this statement is somewhat misleading because it suggests a specific quantification that isn't universally applicable.)
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Some biomes can be too small to see without a microscope. (Biomes are large ecological areas on the Earth's surface and are not typically small enough to be seen with a microscope.)
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An ecosystem is classified by factors such as temperature and precipitation. (This statement confuses ecosystems with biomes; biomes are classified by temperature and precipitation, while ecosystems are defined by the interactions of living things and their environment.)
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