Give a brief account of the counter current mechanism.​

all matter is made up of atoms

in any element all atoms are the same

elements in a compound are always in a constant ratio: apex

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.

because photosynthesis could not occur (apex)