The answer to this question is the term Macromolecule. A macromolecule is termin biology and chemistry that is composed of many / thousands of atoms which is considered as a large / huge molecule. This is made by joining of small subunits to form a huge molecule.
I’m pretty sure it’s A because autotrophs use sunlight to make their own food, so they’d need to be near the surface of the lake to get maximum sunlight.
The Miller-Urey experiment showed that simple molecules could have arisen abiotically. This chemical experiment included conditions similar to those present on the early Earth, and tested the origin of life under those conditions.
Water (H2O), methane (CH4), ammonia (NH3) and hydrogen (H2) were the chemicals used to produce the results of the experiment, the factors needed for simple life to arise. Given similar conditions on other planets, it's possible that life could arise there as well.
The Troposphere, its the closest layer to earth
The answer is: exothermic .
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