The raw material for cellular respiration is

_____________Is an essential phenomenon for the survival of all the living organisms

All the living organisms are made up of small microscopic units called__________

Aerobic Respiration takes place in the presence of______

when we inhale air, it passes through our nostrils into the

______________forms the floor of chest cavity

Many insects like Cockroaches have small openings called________

During exhalation the ribs move______

During heavy exercise we get cramps in our muscles, because of the accumulation of