Nobody cares
It's simple. Checks and Balance's is the answer.
i dont really know .i was looking for how to build one. please help me
get some Lego and then build it simple as
get something narrow like a beam and balance on it, that makes it a balance beam..
A lever
you can build it out of anything if you are smart
You don't.
You need only a simple balance (up to 0,1 g).the answer is a balance
There are many ways in which you could build a simple working model of an ear for a science fair. You could build this out of paper mache for example.
by inventing it
lever
Balance sheet Cash flow