Which statement most accurately describe the process of respiration?

The correct option is this: IT OCCURS CONTINUOUSLY IN THE CELLS OF ALL ORGANISMS AND OFTEN INVOLVE THE EXCHANGE OF GASES.
In humans, respiration involves the breathing in of oxygen and the breathing out of carbon dioxide in order to stay alive. The plants also carry out the process of respiration.

The correct answer is a. when they started making tools that will them in cultivating lands, they could raise crops and that made them attached to one place for a longer period of time. after that, they started domesticating animals and building their own permanent settlements that resemble the ones we have today.