Oh wow thank you I just need to say jdjdkskskskskskksksksksjskksks
Animals are used in experiments because they have somewhat similar structures as humans so they can gauge a human's reaction to something.
Also because the animals can't say no. :(
People who develop an internal locus of control believe that they are responsible for their own success. Those with an external locus of control believe that external forces, like luck, determine their outcomes.