Amajor obstacle to developing good human relations skills is that

a. human relations aren't rewarding.
b. common interests won't to keep a conversation going.
c. people fear taking risks.
d. few persons have common interests.

Which statement is the best summary of the model? a-a series of aerobic and anaerobic reactions take place in cells b- the sun's energy moves through trophic levels in a food chain c-light energy is converted into stored chemical energy plants.d- food molecules are broken down in the cells if living things.