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The mechanism of evolution that has been exhibited here is known as bottleneck effect. The fact that a sudden incident of the tree falling caused the death of rare alleles and this resulted in the decrease in genetic diversity of the population. I hope that this is the answer you were looking for and it has helped you.
Answer:
B. dark brown sea lions blend in with the color of rocks and escape predators
Explanation:
The lighter sea lion population is going down while the darker sea lion population is going up. This means that dark brown sea lions have some kind of natural advantage over light brown sea lions.
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.
