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

Need in all of themmm only answer if you know pls

A-4.60 μc charge is moving at a constant speed of 6.80×105 m/s in the +x−direction relative to a reference frame. at the instant when the point charge is at the origin, what is the magnetic-field vector it produces at the following points.

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)