Humans interact with all levels of the world's ecosystems to obtain all of these necessities except a. shelter b. mates c. food d. energy

The correct answer for this would be letter B. Mates

B, i would think, because we need food for energy, and shelter to live, we dont need a mate.

wind·chill
/ˈwin(d)ˌCHil/
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noun
noun: wind-chill
a quantity expressing the effective lowering of the air temperature caused by the wind, especially as affecting the rate of heat loss from an object or human body or as perceived by an exposed person.