I have no idea what it is help pls lol

I think rainfall

Explanation:

I believe it is rainfall since it is asking how are they directly replenished which means how are themselves being refilled and since it says underground, the ocean doesn't really go underground as much as rain does since rain can literally fall anywhere inland and then go into the ground unlike the rest of these options.

endo:

regulates body hormones, aldosterone, vasopressin

neural:

signal, regulates body using electric signals, reflex

endo has to do with hormones; aldosterone and vasopressin are both hormones. i also had this question and got it right : d