Answer:
A. declines in labor productivity
Explanation:
Fist one correct.
second wrong because not all heat is used for work, some of it lost to other.
third wrong because fuel burn inside is called combustion engine
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Answer:
Great question
Explanation:
is not realistic because nearly everyone doesn't even consider to look at the ad. Most people actually find it annoying when they are scrolling on their feed and all of a sudden an ad pops up.