Take the global trends quiz. click on "answers" at the bottom of the quiz and check your work. explain why it is difficult to calculate the earth's carrying capacity for the human population. (site 1)

The maximum members of the population of species that can be supported by the environment on the basis of the existence of resources is considered as the carrying capacity. It is not easy to determine the carrying capacity for human beings on the planet Earth, as the population of human beings is increasing exponentially on the planet Earth. Due to their intelligence and tendency to resolve the issues associated with the lack of resources, it is not easy to find the carrying capacity of human beings.

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.