Lots of people have asked your question. Here
are some links to answers:
There's even an 'ecosystem and biome song' on
youtube, but I'm not sending you the link, because
the beginning didn't interest me.
Reading a bit of each link, I'd say that
there's a lot of overlap between the definitions
of ecosystems and biomes - that's in the last
link. Ecosystems are generally thought of as
being smaller than biomes, so that there are a
number of ecosystems within one biome. One link
said that biomes consider the non-biological parts
of the environment, too [the 'abiotic' parts] such
as the soil and the weather. I like that, but
Wikipedia says ecosystems also include the
non-living parts of their environment.. I think
of ecosystems as being systems of plants and
animals that live together and compete and
cooperate for food and other resources. I think
'ecosystem' is an older word than 'biome', at
least in terms of common scientific usage.
I recommend checking out Wikipedia.com for
their descriptions of the 2 words, too.
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