An organisms feeding level within an ecosystem

Trophic level, step in a nutritive series, or food chain, of an ecosystem. ... A separate trophic level, the decomposers or transformers, consists of organisms such as bacteria and fungi that break down dead organisms and waste materials into nutrients usable by the producers.

a substance in a physical state in which it does not resist change of shape and will expand indefinitely to fill any container.

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answer; (d) melting of sea ice;