In a forest there are a couple varieties of squirrels. Squirrels with long-tails have better balance and so can jump far distances between trees. Short-tailed squirrels forage mainly on the ground or jump short distances between trees. Scientists observe that over the span of 100 years, the proportion of the population with long tails decreases from 60% to 10% of the population. Which statement is most likely?
The proportion of long-tailed squirrels may have decreased due to decreased predation.
The proportion of long-tailed squirrels may have decreased due to an increase in trees.
The proportion of short-tailed squirrels may have increased due to increased predation.
The proportion of short-tailed squirrels may have increased due to a decrease in food availability.