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Lungs First Evolved in Which Group

question 59

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Lungs first evolved in which group?


Definitions:

Opposite Number

The number that, when added to a given number, results in zero; also known as the additive inverse.

Real Number Line

A line that graphically represents the set of all real numbers in a continuous manner, where each point on the line corresponds to a real number.

Integers

Whole numbers that include positive numbers, negative numbers, and zero, but not fractions or decimals.

Real Number Line

A line that depicts all possible real numbers in a ordered, one-dimensional continuum, with every point on the line corresponding to a real number.

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