State the two main requirements for respiration to occur

Cellular respiration can occur both aerobically (using oxygen), or anaerobically (without oxygen). During aerobic cellular respiration, glucose reacts with oxygen, forming ATP that can be used by the cell. Carbon dioxide and water are created as byproducts.

1. Breathing or Ventilation

2. External Respiration

I'm pretty sure sorry if wrong

answer; the national uniform billing committee(nubc);

all the above is what i would say