According to evidence presented in both the text and video, which statement is the most accurate regarding the relationship between stress and the immune system?
a. Stress activates foreign invaders that would otherwise lie dormant
b. Stress does not cause illness but restrains the immune system's ability to fight foreign invaders
c. Foreign agents invade the body and make it more susceptible to stressors
d. Stressors wear on the body, causing invading agents such as cancer to generate spontaneously

It may seem strange that the selected velocity does not depend on either the mass or the charge of the particle. (for example, would the velocity of a neutral particle be selected by passage through this device? ) the explanation of this is that the mass and the charge control the resolution of the device--particles with the wrong velocity will be accelerated away from the straight line and will not pass through the exit slit. if the acceleration depends strongly on the velocity, then particles with just slightly wrong velocities will feel a substantial transverse acceleration and will not exit the selector. because the acc