The substance which is completely reabsorbed from the filtrate in the renal tubule under normal conditions is

In which part of the nephron are the majority of electrolytes and water ($70$ to $80\%$) reabsorbed from the glomerular filtrate?

Given below are two statements:
Statement $I$: In the nephron,the descending limb of the loop of Henle is impermeable to water and permeable to electrolytes.
Statement $II$: The proximal convoluted tubule is lined by simple columnar brush border epithelium and increases the surface area for reabsorption.
In the light of the above statements,choose the correct answer from the options given below:

What percentage of the filtrate formed per day is reabsorbed by the renal tubules?

The capillary network running parallel to the $Henle's$ loop is called the ......

Passive transport occurs in the case of