knives can be useful if we use it only for cutting fruits and vegetables and it can be harmful if we use it to hurt others (like killing them) or as a weapon
table is useful for dining because we can use it to put things but it can be harmful in eartquakes if the table is vulnerable
muriatic acid is useful in cleaning things and it is harmful because it is a poison
LPG is useful in cooking things but it is harmful because it can start a fire and it explodes if not closed properly
Answers & Comments
Answer:
knives can be useful if we use it only for cutting fruits and vegetables and it can be harmful if we use it to hurt others (like killing them) or as a weapon
table is useful for dining because we can use it to put things but it can be harmful in eartquakes if the table is vulnerable
muriatic acid is useful in cleaning things and it is harmful because it is a poison
LPG is useful in cooking things but it is harmful because it can start a fire and it explodes if not closed properly