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series of interlinked food chains by which energy circulates within an ecosystem.
a chemical used as an antiseptic to prevent bacterial and fungal growth.
energy resources (coal, crude oil and natural gas) derived from the fossilised remains of plants...
a kingdom of plant-like unicellular and multicellular organisms that do not contain chlorophyll...
a small muscular sac in the mammalian body which stores bile.
reproductive or sex cells that contain the haploid set of chromosomes. The male gametes are...
the gamete-producing phase that produces the zygote from which the sporophyte emerges.
the movement of respiratory gases across a respiratory surface.