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Which phrasE bEst dEscribEs an EcosystEm?

AaLL Living things and thE pLacEs on Earth whErE thEy arE found
Borganisms intEracting with Each othEr and with nonLiving things in a cErtain rEgion
CthE variEty of organisms on Earth or in a particuLar arEa of thE biosphErE
Da group of Living things that can intErbrEEd to rEproducE