What is the name for the vertical cleft in the concave medial surface of the kidneys?

Toward the center of the inner concave surface of the kidney is the notch is called hilum. through which utrear ,blood vessels and nerves center .inner to the hilum is the board funnel shaped space called the rennel pelvis. with projection is called calyces. the outer layer of kidney is a though capsule.

Explanation:

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the dark variety, as they are not visible on the dark tree barks

explanation:

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate