Do roaches bite? can they harm us?
They can scare the crap out of us...
No, but they do make you sick
No, but the junk they walk around in can carry a lot of diseases.
Some do bite. Once when I went to camp (long time Ago) they were are all these roaches and the counselor is all "You better not hurt the roaches. you don't mess with nature" lol :)
Yes, they can bite but rarely do. They prefer to go after something that is not moving but if they are hungry enough, they might bite you while you're asleep. They can harm us because they carry diseases which can be harmful to humans.