The correct answer is D. The bird population is modeled with an exponential equation, because the population decreases by a constant percent rate each year.
An exponential function is a function belonging to transcendental elementary functions in mathematics. It is defined for all real numbers and gets positive real numbers as result.
The exponential function tells us what is the value of a particular constant called the base number raised to the power given by the variable. The base number can be any positive real number except one.
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