An ecosystem may strengthen.Logical formLearned from3 sentences. An ecosystem can be prohibitive.Logical formLearned from3 sentences. Experts may discuss ecosystems on sustainable development of land.Logical formLearned from3 sentences. Crabs may threaten an ecosystem.Logical formLearned from3 sentences. Ecosystems can be in a lake.Logical formLearned from3 sentences. A spill can be disastrous for ecosystems.Logical formLearned from3 sentences. Ecosystems can be prehistoric.Logical formLearned from3 sentences. A natural resource may tax an ecosystem.Logical formLearned from3 sentences. Grass can be a part of an ecosystem.Logical formLearned from3 sentences. An ecosystem can be constituted-of-or-filled-with trees.Logical formLearned from3 sentences. A canal may disrupt an ecosystem.Logical formLearned from3 sentences. A threat can be to deep-sea ecosystems.Logical formLearned from3 sentences. Restrictions can be on shipping through an ecosystem.Logical formLearned from3 sentences. An ecosystem may pertain-to a desert.Logical formLearned from3 sentences. Ecosystems can be on planets.Logical formLearned from3 sentences.