blog #4 natural selection

directional selection is - this is when individuals with a trait have a higher fitness than the others without-birds with bigger, thicker beaks can feed more easily on larger, harder thicker-shelled seeds. if theres a food shortage that leaves only large thick seeds. the birds with bigger beaks have a higher access food which means the adapted birds have a higher fitness, and the average beak size shall increase.

stabilizing selection is - this is when average individuals have a higher chance of living - when babies are born small ones have a chance of getting sick which lowers there fitness but bigger ones have difficulty being born so the average baby has the highest fitness.

Disruptive selection is - when  individuals in the the middle of species have the lower chance of living - like when seeds of medium size are less common the bird has the least chance of survival compared to birds that eat big and small seeds.