Which best explains why a wood-burning fireplace represents an open system?

a. because they are not all made of brick
b. because a fire requires oxygen from the atmosphere to burn
c. because they can be used for cooking
d. because the ashes have to be swept away

answer; (arch); good luck

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min

part 1: which substance has a higher solubility?

a

smallest amount left undissolved atall temps in table shown most has dissolved high sol'by