Alpine marmots are a type of rodent that have the ability to decrease their body activity to conserve food. these marmots most likely

The answer is: Hibernan.

Explanation:  

The marmots are isolated in their burrows completely from the cold that takes over the surface during the winter, which go into hibernation. The body temperature is then reduced to between 4.6 and 7.6 ° C, breathing at two or three times per minute and pulsations at ten per minute. In order to accumulate winter reserves, groundhogs devour large amounts of herbs, roots included and develop a thick layer of subcutaneous fat during the fall.

The answer is: Hibernan.

coal is not sustainable because it will one day run out.