The loop of henle dips into the renal cortex. this is an important feature of osmoregulation in terrestrial vertebrates because

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The loop of Henle dips into the renal cortex. this is an important feature of osmoregulation in terrestrial vertebrates because "differential permeability of ascending and descending limbs of the loop of Henle is important in establishing an osmotic gradient."

It would be the equator.

The name of the instrument that the scientist uses is called a microscope.a microscope is used to view objects which is not visible to the naked eyes