Why is it important for us to learn how to write CER?

the question isn't complete here so i can't right an answer '_'

sound moves fastest in solids because the molecules are tightly packed and it allows sound to vibrate

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.