Whats the similarity between biosphere and ecosystem

Ecology is differentiated into the organization levels initiating with the biosphere, ecosystems, populations, communities, organism, matter, cell, and an atom. The region enveloping the earth and supporting life is called the biosphere. The biosphere comprises various ecosystems. The ecosystem refers to a biological community of associating species and their physical surrounding.  

The similarity between an ecosystem and a biosphere is that they both exhibit organisms that rely on each other and associate.  

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.

it is a limiting nutrient limited by a single nutrient in the ecosystem, & the single goes very slow.