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the sequence of events relating to the flow of blood or blood pressure in the heart that occurs from the beginning of one heartbeat to the beginning of the next.
the passage through which the nerve and blood vessels leave the root of the tooth.
substances that have a harmful effect on the environment and also on human health.
the process whereby a particular change causes a response which reverses that change.
the excessive growth of algae in eutrophic streams, rivers and dams.
an organism that helps to spread a disease, but is not infected with the disease.