• If the distance between Earth and the Moon decreased by half, how would it affect the weight of a person on Earth?

Can someone me with 3 and 4 plz. this is for masteries test.

Ants live on acacia trees in south america. the ants feed on sugars secreted by the trees. the trees provide room for the ants to live. the ants sting any other insect or animal that comes to eat the trees. what type of relationship is this?

If 22.5 of nitrogen at 748 mm hg are compressed to 725 mm hg at constant temperature. what is the new volume?