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the space in the middle of the tooth which contains cells, blood vessels and a nerve.
atmospheric gases, especially carbon dioxide, methane, nitrous oxide, ozone and water vapour,...
an organism's ability to regulate or maintain its own body temperature.
a person who does not eat animal flesh, but does usually include milk and eggs in their diet....
involuntary muscle found in the walls of blood vessels, in digestive, respiratory, urinary and...
identical strands of a chromosome produced by the doubling of genetic material during cell...