Answer:
The answer given by others are wrong the right answer is all of them but not Baptists in Virginia
Explanation:
The amount of air in a room never changes:
Explanation:
Answer:
absolute brightness
Explanation:
The observational fact about a cepheid variable star that leads to a measurement of its distance from earth is that its period of variation is directly related to its absolute brightness
Answer:
C would be the correct answer
Answer:
Work done by effort is called hard work.
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