1)
the snowshoe rabbit has white fur in winter and dark fur in summer. what is the main survival advantage of this fur color change to the rabbit?
a) the light fur keeps the rabbit from getting sunburned in summer.
b) the fur color is an adaptive form of camouflage to avoid predators.
c) the dark fur absorbs more sunlight so the rabbit is warmer in winter.
d) the white fur is more valuable to fur trappers, so the animal will be trapped and better fed in winter.

the two answers are a, the population of birds with large beaks will increase on the island, and c, the trait for large beaks will be passed on to future generations through natural selection. the reason for that is because if the birds that have beaks developed for eating small seeds lose all of their food, they will go hungry and eventually starve because they physically cannot eat the large seeds, therefore making the population of large beaked birds higher. also, if the trait of large beaks are dominant on the island over small beaks, then over time the large beaked birds will reproduce more and more, while the smaller beaked birds will reproduce less and less because they can't survive with the food provided. that leads to the trait of small beaks disappearing and the trait of large beaks taking over the island.