What is $RAAS$?

Which one of the following is both a hormone and an enzyme?

The urine of a man is very dilute,the quantity of urine is excessive,dehydration has started in his body,and he is very thirsty. This condition is caused by:

$JG$ cells of the kidney secrete:

Arrange the following events occurring in the Renin-Angiotensin mechanism in the correct order:
$A$. Increase in blood pressure and Glomerular filtration rate.
$B$. Reabsorption of $Na^+$ and water from distal parts of the tubule due to Aldosterone.
$C$. Fall in Glomerular filtration rate.
$D$. Vasoconstriction by Angiotensin $II$ and release of Aldosterone.
$E$. Renin converts Angiotensinogen into Angiotensin $I$, followed by Angiotensin $II$.

In cases of excessive bleeding,profuse sweating,or prolonged delay in fluid intake,what happens to the glomerular filtration rate?