Answer:
Mast Cells
Explanation:
Mast cells release histamine in the blood stream, when they detect a substance that triggers an allergic reaction, also called an allergen.
Would be same everywhere !! mechanical energy is always constant !
and it doesn't matter air is present or not....total energy is always constant !
Wave height that should be it;)
4 and F, 9and E r 2 of the answers
