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During gas exchange,oxygen and carbon dioxide always move:
Worker
An individual employed to perform tasks or services, usually in exchange for compensation.
Lowest Terms
A fraction is said to be in its lowest terms when it is reduced such that the numerator and denominator are the smallest whole numbers possible.
Products
The result of multiplying two or more numbers together or items produced for consumer use.
Fractions
Numerical quantities that represent a part of a whole, typically with a numerator and denominator.
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