This
is a specific response because in order to fight antigens, white blood cells,
the most important cells of the immune system, must produce large, Y-shaped
proteins known as antibodies to fight these invaders. This is a type of
specific defense (as I have identified antibodies as specific defenses is the
chart above).
<span> </span>
The investment in education and training for people.
Mammals are adapted to live in land, air, and water, so the answer is D, all of the above.
