External Respiration takes place in the Trachea. When oxygen and co2 "switch" its where they connect and making this external respiration!
I hope this helps you!
Cellular respiration<span> enables the cell to produce 34 ATP molecules per glucose molecule in addition to the 2 ATP molecules obtained from glycolysis. ... </span>Compare the energy flow in photosynthesis to the energy flow in cellular respiration<span>.</span>
B is the answer. my aunt has a malignant tumor and that means its active