The eggs and larvae of marine animals tend to require water with more dissolved oxygen in it than the adults do. If water flows from a freshwater source into a salt water bay, what effect would this have on the population of marine animals? The freshwater would decrease the populations of marine animals because it would deplete the salt water of oxygen. The freshwater would decrease the populations of marine animals by decreasing both salinity and oxygen levels. The freshwater would increase the populations, thereby decreasing the levels of oxygen and marine animals. The freshwater would increase the populations of marine animals because it holds more oxygen than the salt water.

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.