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the protection of species, habitats and ecosystems and the management of natural resources.
the cavity used for transport purposes. It has one opening to the environment through which...
the space in the middle of the tooth which contains cells, blood vessels and a nerve.
a serious and potentially fatal medical state caused by an allergic reaction, in which sufferers...
a chemical used as an antiseptic to prevent bacterial and fungal growth.
the difference between the concentrations of a specific molecule in two adjacent areas.