"Explain WHY oxygen moves from the blood stream into the cells of the body and why CO2 moves out of cells and into the blood stream what makes them move the direction they do (like literally why do they move the way they do"

a unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.

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.

to this one it would be receptive field