An expense may pertain-to an ecosystem.Logical formLearned from4 sentences. A defense may pertain-to an ecosystem.Logical formLearned from4 sentences. An ecosystem can be for plants.Logical formLearned from4 sentences. Ecosystems can be fundamental.Logical formLearned from4 sentences. Mangroves can be an ecosystem.Logical formLearned from4 sentences. A river can be an ecosystem.Logical formLearned from4 sentences. Students may explore ecosystems.Logical formLearned from4 sentences. Ecosystems can be interrelated.Logical formLearned from4 sentences. An ecosystem can be lowland.Logical formLearned from4 sentences. Trends can be in an ecosystem.Logical formLearned from4 sentences. An option can be in (forest ecosystem science).Logical formLearned from4 sentences. Nitrogen may enter an ecosystem.Logical formLearned from4 sentences. Concerns can be about ecosystems.Logical formLearned from4 sentences. Ecosystems can be weakened.Logical formLearned from4 sentences. Changes can be in (ecosystem processes).Logical formLearned from4 sentences.