Answer:
Knife is useful but why? It can help us cut some things we couldn't cut, without a knife we can't cut thick foods (like those big pork,meat, and fish) but it can also be harmful sometimes, it can damage our finger if we're not CAREFUL
Any type of acid can be very harmful for us, like those Poisonous ones, just one breathe or touch it, a human can die in no time
Explanation:
not really sure if my grammar is correct but i hope this will help you
