Research can be on (student understanding) of ecosystems.Logical formLearned from4 sentences. Ecosystem may undergo a preservation.Logical formLearned from4 sentences. Some participants can be in an ecosystem.Logical formLearned from4 sentences. Ecosystems may be threatened by deforestation.Logical formLearned from4 sentences. Information can be on ecosystems.Logical formLearned from4 sentences. A balance may pertain-to aquatic ecosystems.Logical formLearned from4 sentences. Areas can be ecosystems.Logical formLearned from4 sentences. An (ecosystem management approach) can be integrated.Logical formLearned from4 sentences. (Ecosystem effects) may pertain-to a fishery.Logical formLearned from4 sentences. Relationships can be within an ecosystem.Logical formLearned from4 sentences. Organisms can be in an ecosystem.Logical formLearned from4 sentences. Ecosystems can be fertile.Logical formLearned from4 sentences. Persons may depend on ecosystems.Logical formLearned from4 sentences. Changes can be in a hierarchy of (ecosystem processes).Logical formLearned from4 sentences. Some (research sites) can be in variety of ecosystems.Logical formLearned from4 sentences.