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

Identify two factors that determine the rate of stream erosion

Aparticle of mass m is projected with an initial velocity v0 in a direction making an angle α with the horizontal level ground as shown in the figure. the motion of the particle occurs under a uniform gravitational field g pointing downward. (a) write down the lagrangian of the system by using the cartesian coordinates (x, y). (b) is there any cyclic coordinate(s). if so, interpret it (them) physically. (c) find the euler-lagrange equations. find at least one constant of motion. (d) solve the differential equation in part (c) and obtain x and y coordinates of the projectile as a function of time. (e) construct the hamiltonian of the system, h, and write down the hamilton’s equations (canonical equations) of motion.

If a balloon is taken outside on a very cold day, what will occur?