The $pH$ value of human urine is:

Which one of the following correctly explains the function of a specific part of a human nephron?

Kidneys are reddish-brown,bean-shaped structures situated between the levels of . . . . . . thoracic and . . . . . . lumbar vertebrae.

Draw a labeled diagram showing the various parts of the human excretory system.

Identify the odd one out.

Identify the correct statements:
$I.$ The outer layer of the kidney is called a capsule.
$II.$ The kidney is divided into an outer cortex and an inner medulla.
$III.$ The medulla is divided into medullary pyramids.
$IV.$ The cortex extends in between the medullary pyramids,which is called the columns of Bertini.
Choose the correct option accordingly.