Red blood cells are considered ... Because they were highly specialized A- Unipotent B- Totipotent C- Mulipotent D4 pluripotent

b. the carbon cycle ensures living things have a source of hydrogen

the answers are a and c

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.