Answer: A. the mid-ocean ridges
Explanation:
The features that form the longest mountain range on Earth is the mid-ocean ridges and spans about 40,389 miles around the earth.
The mid-ocean ridge has about 90% of its system under the ocean. They are formed as a result of the movement of tectonic plates.
The best and most correct answer among the choices provided by your question is the first choice or letter A.
The geographic isolation of two populations of a species tends to increase differences between their gene pools because it <span>prevents interbreeding between the populations. </span>
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A superpower is a country which is very strong internationally and which exercises its power and influence on the neighboring countries.
Among the options, Greenland has too small population to be a superpower, and Mexico is a developing economy still. Both US and Canada are strong economically, but it's the superpower.