Help with 15 - 17 please!

weather forecasts are done by collecting data about the current state of the atmosphere mainly the temperature, humidity and wind and using meteorology, to determine the atmosphere that evolves over time. the h and l mean the high and low pressure. the red strip is a warm front. the blue strip is a cold front. the blue and red strip is a stationary front. the purple strip is a occluded front.

explanation:

ill do it for 100, also this isnt 80 its 40

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.