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

Three archers each fire four arrows at a target. joe’s four arrows hit at points 10 cm above, 10 cm below, 10 cm to the left, and 10 cm to the right of the center of the target. all four of moe’s arrows hit within 1 cm of a point 20 cm from the center, and flo’s four arrows hit within 1 cm of the center. the contest judge says that one of the archers is precise but not accurate, another archer is accurate but not precise, and the third archer is both accurate and precise. which description applies to which archer? explain

Phase changes are chemical changes. true or false

If steel is more dense that lake water, why can a boat float