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bitter yellow or green alkaline fluid secreted by the liver, which serves to emulsify fats
the hormone produced by the beta cells of the Islets of Langerhans in the pancreas, which...
series of interlinked food chains by which energy circulates within an ecosystem.
a pure substance made of only one type of atom. An element cannot be broken down into simpler...
a space or gap between two teeth. Many species of mammals have diastemata as a normal feature,...
the protection of species, habitats and ecosystems and the management of natural resources.