In the kidneys, both useful substances and wastes are removed from the blood by? a. reabsorption. b. excretion. c. dialysis. d. filtration

D. filteration

Explanation:

Kidneys are the two vital organs of human body. The primary function of kidneys is to expel out waste substances out of the body. Also, the useful substances when enters into kidneys through blood stream are selectively reabsorbed and transfered to blood stream. This process is called as filteration.

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.