You observe that the snow pile on your yard has decreased in size although the temperature has not been above freezing since the last snowfall what most likely occurred

Explanation:

You can't forget the body heat.

The weather temperature could be the same, but another variable is implicitly involved: your hand natural heat. All living creatures sprout energy and human beings are not the exception.

So, in this case your hand heat is causing this phenomenon.

answer: they produce more slow than unicellular organisms.