The answer is letter A. When you notice the soft sound of rain on the roof, it has crossed a perpetual line called your absolute threshold for detecting an auditory signal. Absolute threshold is the smallest energy that stimulates our human senses such as hearing, seeing, smelling, etc.
Answer:
C the September 11 ,2001 terrorist attacks
Answer:
1. when and how it was found 2. when they sent rovers or machines 3. Facts about the plant
Explanation:
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