When one drug adds or magnifies the effect of another drug it is called?

20 in the formula no3, what does the subscript 3 mean?

Plzz hurry im being timed during times of vigorous physical activity, muscles require a constant supply of oxygen. how does the body respond to these needs? a. breathing rate and heart rate both decrease. b. breathing rate and heart rate both increase. c. heart rate decreases, but breathing rate remains stable. d. breathing rate increases, but heart rate remains stable.

Mineral rich water heated by newly found oceanic crust escapes through cracks in the ocean floor called