A permeable underground layer of rock, sand, and gravel saturated with groundwater is called a(n) ________.

A. aquifer
B. natural spring
C. submergence
D. hot spring


Answer: A

Biology & Microbiology

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Water enters the water vascular system of a sea star through a structure called the ____

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The graph above shows the survival of sociable weavers as a function of body mass. Sociable weaver body mass

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