How should I record my business transactions? Purchases, sales, payroll, and other transactions you have in your business generate supporting documents. These documents contain information you need to record in your books. What is the burden of proof? The responsibility to substantiate entries, deductions, and statements made on your tax returns is known as the burden of proof.
Mice will probably open their eyes when they're about 10-14 days  old. About the time the hair is fully covering them they open their  eyes.
About ten to 14 days after birth, the kitten will slowly start to open her eyes. It will begin as a thin slit. Slowly but surely the eyes will open completely and shed the film. Short haired kittens will usually open their eyes faster than long haired cats.