1) You don't have to raise offspring
2) Reproduces faster
3) One parent to produce offspring
so people can see the variations of genetic. Like which is more likely to happen and less likely. Which ever is dominate and which isnt
"B" It is based on repeated investigations. It can always be proven false. It might not be, and it is NOT equivalent to a scientific law. A scientific law is something that is true, and nothing could change it. It is a fact.
I hope this helps!
~kaikers
