What usually attaches the kidneys to the retroperitoneum?

The region of the kidney between the capsule and medulla is called the renal cortex. 9

The T12 and L3 vertebrae attach the kidneys to the retro peritoneum.The areas between the renal pyramids are called the renal columns.

explanation:

the sun shines white and black light to our planet. the white light has all the colors in it. in our upper atmosphere, we have dust particles and oxygen molecules. the white light meaning all of the colors in a rainbow shines through the upper levels of the atmopshere and the blue light scatters across the entire planet. that is why our sky is blue.