It is warmer at the equator than at 80° N because .

the sun's energy is spread out over a larger area at the equator
the sun's energy is spread out over a smaller area at the equator
the equator receives more sunlight
the equator is closer to the sun

he movement of air through earth's or any planet's atmosphere is called wind, and the main cause of earth's winds is uneven heating by the sun. this uneven heating causes changes of atmospheric pressure, and winds blow from regions with high pressure to those with low pressure.

i hope this : )

organ system-an organ system is a group of organs that work together to perform one or more functions. each does a particular job in the body, and is made up of certain tissues.