Construct a dialogue between your friend about the online class

I’m stuck on this question cuz i’m stupid sksksksk

What is the name of the idea that energy cannot be created nor destroyed

What is the purpose of a punett square? a: finding the number of offspring people can haveb: predicting the outcome of genetic crosses c: finding how many genes a person has d: predicting the outcome of a coin toss (i think it's b or c but i'm not sure)