Passive transport occurs in the case of

$A :$ Tubular secretion is of considerable importance in marine teleost fishes.
$R :$ These have aglomerular kidney,$i.e.$,no filtration occurs and tubular secretion is the only way of excretion.

The brush border is a characteristic of ..........

Which one of the following is mismatched?

Where does the selective reabsorption of glomerular filtrate take place?

The Loop of Henle is found in the ........