How could several rocks, each formed in a different place, all end up in your back yard?

a=c and then d= c because of the band so you get ac/dc and you add them together you get sound waves

i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.

friedrich meischer discovered it in white blood cell