The flu is an infection caused by a pathogen. When a pathogen enters the body, which blood component helps us to attack the pathogen?

plasma
white blood cells
platelets
red blood cells

Several mountains together form a mountain . a few of these combined form a mountain system. several systems combined form a mountain , which can stretch thousands of miles in length.

Abaseball is thrown from the outfield toward the catcher. when the ball reaches its highest point, which statement is true? (a)its velocity is not zero, but its acceleration is zero. (b) its velocity and its acceleration are both zero. (c) its velocity is perpendicular to its acceleration. (d) its acceleration depends on the angle at which the ball was thrown. (e) none of the above statements are true.

The ability to make things happen is also called a. heat b. force c. matter d. energy