This definition above refers to the geographic isolation.
It means exactly what it says in the definition - one species is left behind from the rest of the population, and it stays in that particular location, evolving and changing from the species and population it was once a part of.
C. Ice is less dense than water which means water condenses when it freezes allowing the ice in a lake to float on top of the water preventing the water below from freezing.
It keeps the temperature on Earth - moderate
Earth would overheat if the sea wasn't able to retain large amounts of heat
That would be : adenine, thymine, guanine, and cytosine.
