There is external and internal so I'll list th external. The most important is skin then mucus, sweat or secretion, hair, nails and tears which are all part of the integumentary. Some internal defenses are white blood cells and T cells.
Answer:
A
Explanation:
A, the guy with 1 star provided the most noneducational response I've ever seen.
Answer:
The water molecules move by active transport into the cell from low water concentration to high water concentration
It is the major sight of water absorption.
