Which contributes to Earth's ability to sustain life? A. The atmosphere allows all of the sun's radiation to enter due to Earth's distance from the sun.
B. The atmosphere prevents all space debris from reaching the surface due to the ozone layer.
C. The atmosphere is extremely thin due to the temperatures of the sun.
D. The atmosphere is breathable due to the unique mixture of gases.

D

Explanation:

This is because the atmosphere is refreshable and makes breathing so conducive.

1. a tropical dry forest carries out more rapid nutrient cycling

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.