A (plant canopy) can be on trees of a (forest ecosystem).Logical formLearned from4 sentences. Students may learn about ecosystems.Logical formLearned from4 sentences. A natural balance may pertain-to an ecosystem.Logical formLearned from4 sentences. Research can be for a marine ecosystem.Logical formLearned from4 sentences. An island may have variety of ecosystems.Logical formLearned from4 sentences. An ecosystem may offer a laboratory.Logical formLearned from4 sentences. A trend can be in degradation of ecosystems.Logical formLearned from4 sentences. (Energy production) can be on a structure of ecosystems.Logical formLearned from4 sentences. (Sequestering excess) can be in terrestrial ecosystems.Logical formLearned from4 sentences. A way can be in ecosystems.Logical formLearned from4 sentences. A role can be in an (ocean ecosystem).Logical formLearned from4 sentences. Elk can be in an ecosystem.Logical formLearned from4 sentences. An one may surround an ecosystem.Logical formLearned from4 sentences. An influence can be on ecosystems.Logical formLearned from4 sentences. A base may pertain-to an ecosystem.Logical formLearned from4 sentences.