Fewpal
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(a) Biomagnification — Accumulation of chemicals at the successive trophic levels of a food chain
(b) Ecosystem — Biotic components of environment
(c) Aquarium — A man-made ecosystem
(d) Parasites — Organisms which obtain food from other living organisms

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(b) Is not a matching pair
Both biotic and abiotic components of environment constitute an ecosystem

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