The main factor that controls the rate of breathing is..
A.) concentration of carbon dioxide.
If we think about it.. When we breath in oxygen, right away it enters your lungs and turns into carbon dioxide. Well since your lungs need to process oxygen and bring oxygen into the blood stream. Then as soon as the oxygen comes inside (inhale) the oxygen turns into carbon dioxide and you breath it out (exhale) to get a new oxygen load.
Makes sense? lol
Good Luck! :)
Answer:
The answer would most likely be D.) Tomato. Was there any chart or photo attached to this question?
How do sensory receptors make it possible for you to perceive external stimuli?
It converts things like light, chemical molecules, sound waves and pressure to chemical messages that can be transmitted by the nervous system and interpreted by the brain
