Answer:
A standard dimension for sandwiches and rulers
What must be looked through in order to see?
What can be white and yellow at the same time?
It covers you, you lose it every day and you'd die without it.
What object has keys that open no locks, space but no room, and you can enter but not go in?
A word of five letters, Upside down is the same, A shark does this, But itβs not to blame. What is the word?