It's the Immune system!
good luck
Answer:
Not 100% sure but I do think that its the kinetic energy. Hope this help you.
<em>I hand to look it up.. but everything said </em><em>kinetic energy.</em><em> Really hope this helps.</em>
The study of human interaction with the natural world over time is environmental history, emphasizing the active role that nature plays in influencing human affairs and vice versa. ... The first, nature itself and its change over time, includes human physical impact on the land, water, atmosphere, and biosphere of the Earth.
