Water is less dense as a solid than as a liquid. Normally this is reversed. Water has its maximum density at 4 degrees Celcius.
The fact that ice is less dense than water allows it to float on top of ponds so fish, frogs, etc can survive winters.
<span> this is the answer : Exoskeletons.</span>
Answer:
Genetic drift can result in the loss of rare alleles and can decrease the size of the gene pool
