The answer is B.
Which is “When the air is in the respiratory
medium, there is a greater risk that the tracheal tubes will collapse. The
cartilage in the respiratory system gives support
to the tubes against negative or positive
pressure, during respiration, hence keep
it open.
That would be Directional Selection so the answer is D.
I believe the correct answer is *B* <span>mitosis; differentiation </span>
The special type of process is the ability to store water. Hope this helps ^-^
