What must occur for entropy to decrease?
a. energy must be added to the system.
b. energy must be removed from the system.
c. the first law of thermodynamics must be broken.
d. the second law of thermodynamics must be broken.

According to proper standing posture, from a side view, which parts of the body should be aligned? a. ear, shoulder, hip, knee, and ankle b. stomach, hip, knee, and ankle c. nose, shoulder, hip, knee d. ear, shoulder, fingers, ankle

What are the five food groups recommended by the usdas my plate food guidance system

When is it most common for humans begin to develop a sense of self worth? a. adolescence b. early childhood c. infancy d. late childhood