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chemicals used as the propellants in aerosol sprays, as coolants in fridges, air conditioners and polystyrene, which damage ozone molecules in the ozone layer.
endocrine gland situated on top of each kidney, which produces hormones in response to stresses...
the excessive growth of algae in eutrophic streams, rivers and dams.
the layer of fatty material that is usually only surrounds the axon of a neuron. It is made from...
a thin hairlike outgrowth of an epidermal cell of a plant root that increases the surface area...
group of similar organisms that can breed with each other to produce fertile offspring. It is...