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The ozone layer is a thin part of the Earth's atmosphere that absorbs almost all of the sun's harmful ultraviolet light. "Ozone holes" are popular names for areas of damage to the ozone layer.
Radiocarbon dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon, a radioactive isotope of carbon.
Blood pressure, force originating in the pumping action of the heart,
exerted by the blood against the walls of the blood vessels;
the stretching of the vessels in response to this force and their subsequent contraction are important in maintaining blood flow through the vascular system.
Chemical reactions that take place inside living things are called biochemical reactions.
An enzyme is a substance that acts as a catalyst in living organisms, regulating the rate at which chemical reactions proceed without itself being altered in the process.