Answer:
Walls are thin.
Inner surface is moist.
Tissues are filled with blood vessels.
Exposed to air
Explanation:
Because some of them are immune and only works for one thing in the system
A) Cell wall (animal cells don't have these structures)
The chemical change of glucose and oxygen into energy is called <span>Aerobic Respiration. With the formula: (</span><span>C6H12O6) </span><span>+ </span><span>6O2 </span><span>= (</span><span>6CO2) </span><span>+ </span><span>6H2O </span><span>+ </span><span>E.</span>
