14. How do your kidneys help maintain water-salt balance?

A. Both A and B

B. Controlling the frequency of urination.

C. Changing the concentration of your urine.


15. Which two systems are in charge of signaling within the body?

A. Nervous and endocrine

B. Integumentary and immune

C. Circulatory and respiratory

Respuesta :

Answer:

14.A  

15.c

Explanation: