I am pretty sure the answer is B. hope this helps and if it is wrong pls tell me thanks! :)
Please translate to English
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All that is needed is a warmer, lighter fluid below a cooler, heavier one.
Since warm water is lighter, it will rise, and will cool from the top will flow down to replace it, this makes it go in motion
Answer: wetlands
Explanation: Wetlands are considered the most biologically diverse of all ecosystems.
Oort cloud: a spherical region that surrounds the solar system, that extends from the kuiper belt to almost halfway to the nearest star, and that contains billions of comets
