Persons may investigate an (ecosystem functioning) of lakes.Logical formLearned from2 sentences. Ecosystems may undergo a consideration.Logical formLearned from2 sentences. Reefs can be important to an ecosystem.Logical formLearned from2 sentences. Ecosystems can be exotic.Logical formLearned from2 sentences. A (food chain) may pertain-to an ecosystem.Logical formLearned from2 sentences. An ecosystem may undergo an introduction.Logical formLearned from2 sentences. Sustainable management may pertain-to an ecosystem.Logical formLearned from2 sentences. A focus can be on ecosystems.Logical formLearned from2 sentences. (Ecosystem functions) can be terrestrial.Logical formLearned from2 sentences. An unit may pertain-to an ecosystem.Logical formLearned from2 sentences. (Fishery species) can be within a (shelf ecosystem).Logical formLearned from2 sentences. Marine mammals can be components of a marine ecosystem.Logical formLearned from2 sentences. Trends may pertain-to an ecosystem.Logical formLearned from2 sentences. Ecosystems can be herbaceous.Logical formLearned from2 sentences. Ecosystems may be monitored.Logical formLearned from2 sentences.