It just depends what you are studing:
Answer: I feel that the theory of plate tectonics is correct, because we use friction every day which means friction could make vibrations larger too!
Answer:
Nitrogenous;Acid-Base and Fluid
Explanation:
The kidney is referred to as an excretory organ because it excretes nitrogenous wastes. It is also a major homeostatic organ because it maintains the electrolyte Acid-Base, and fluid balance of the blood.
A state of balance between continuing processes