The enzyme through which hydrogen ions (h ) travel back into the cell after being transported outside the membrane by the electron transport chain is called:

The correct answer is - ATP synthase.

Explanation:

The role of ATP synthase which is an enzyme highly present in all domains of living organisms by converting into chemical energy by producing ATP which is essential for the most of the cellular functions and reactions.

The proton or hydrogen ion is pumped during the electron transport chain is used to synthesize ATP. Protons move back into the matrix once it transported outside the cell.

Thus, the correct answer is - ATP synthase.

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.