Explain how to determine polarity of the bonds in HCCl3 and explain how to determine polarity of the entire molecule HCCl3

B) movement of materials into and out of the cell

I'm pretty sure its c

The correct answer is:   [a]:   "polar easterlies move cool air to the mid-latitudes."

The internal energy of the system we can term it as total potential energy and kinetic energy. energy flows out of the surrounding from the system then we can say that the internal energy of the final state is lower than its initials. the sign of  δesystem is negative.δesystem = efinal - einitial=-ve  efinal  ∠einitial.