Answer:
Left to right Iām quite bright. Right to left I might bite.
Die without me, never thank me. Walk right through me, never feel me. Always watching, never speaking. Always lurking, never seen.
I am the fountain from which no one can drink. For many I am considered a necessary link. Like gold to all I am sought for, but my continued death brings wealth for all to want more.
The man who made it didn't need it. The man who bought it didn't use it. The man who used it didn't want it.
What has roots as nobody sees, is taller than trees. Up, up it goes, and yet never grows?
I have two eyes in the front and a lot of eyes on my tail
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?