Food for animals such as bear, and food for humans
Recently scientists have become interested in the unique slime that hagfish produce and that research will probably lead to some new technology, so yes the jawless fish are useful to man.
A useful young man
Fish live in it
Both are acceptable, depending on context. For example:Fishing bait is useful to fisherman.Fishing bait is useful for catching fish.
Of course it is in its name.
both
Because man will feed the fish.
Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime. -Chinese Proverb
biology is useful in every one
giraffes useful to mankind ?
so they can see , spastic.
This is a Chinese proverb which is quoted as "Give a man to fish and you will feed him for a day, teach a man to fish and you will feed his for a lifetime"