Give example of each

Sure, I can provide an example for each. Here are three examples:

1. In mathematics, an example of a Prime number is 13, as it is only divisible by 1 and itself.
2. In Biology, an example of a vertebrate is a human, as we have a backbone and spinal column.
3. In chemistry, an example of a chemical reaction is the combination of hydrogen and oxygen to form water, represented by the equation 2H2 + O2 -> 2H2O.