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living
a ductless gland that secretes hormones directly into the bloodstream, to be transported to...
sharp-edged modified last upper premolar and the first molar in carnivores adapted to shear or...
blood that has no antibodies (blood group AB) and can receive any type of blood.
gas consisting mainly of methane and carbon dioxide, which is produced as a result of...
series of interlinked food chains by which energy circulates within an ecosystem.