Humans may affect an ecosystem.Logical formLearned from3 sentences. A report can be on a state of ecosystems.Logical formLearned from3 sentences. Ecosystems can be systems.Logical formLearned from3 sentences. Some characteristics can be constituted-of-or-filled-with ecosystems.Logical formLearned from3 sentences. Restoration can be in ecosystems.Logical formLearned from3 sentences. Communities may pertain-to an ecosystem.Logical formLearned from3 sentences. Concentrations can be in ecosystems.Logical formLearned from3 sentences. (Freshwater ecosystems) may function.Logical formLearned from3 sentences. Environmental impacts can be on ecosystems.Logical formLearned from3 sentences. Levels can be constituted-of-or-filled-with (ecosystem functioning).Logical formLearned from3 sentences. (Ecosystem responses) can be to changes.Logical formLearned from3 sentences. A role can be in (forest ecosystems).Logical formLearned from3 sentences. (Freshwater ecosystems) may pertain-to persons.Logical formLearned from3 sentences. Problems may confront (freshwater ecosystems).Logical formLearned from3 sentences. Pollutants can be in ecosystems.Logical formLearned from3 sentences.