Which of the following objects would best be used to understand how the human heart works? a.) plastic bag b.) water pump c.) coffee filter d.) block of wood

I'd say B) water pump because the heart pumps blood through your veins just like a water pump pumps water through the faucet? Lol Its B)

a time line cause it goes from 685 to 978

2%? i tried finding the exact sorry if it's not 100% correct ; -;