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When opportunity costs are constant,the PPF will be a straight line.
Potential Energy
The stored energy in an object or system due to its position or configuration.
Positron Emission Tomography
A type of medical imaging technique that uses radioactive substances to visualize and measure changes in metabolic processes and other physiological activities in the body.
Metabolism
The set of life-sustaining chemical transformations within the cells of living organisms that allows them to grow, reproduce, maintain their structures, and respond to their environments.
Isotopes
Variants of a chemical element that have the same number of protons but different numbers of neutrons in their atomic nuclei, resulting in different atomic masses.
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