Guanine and adenine hope that helps I think
Peer review. This is the basis of much of the scientific method: repeatability.
The answer is A, comparative anatomy, since you're comparing the two cat species.
Cell A = Sperm cell
Sex of rabbit = Male (bc males produce sperm cells)
The offspring is not genetically identical to either parent because in sexual reproduction, the offspring receives one full set of genes from each parent, making the offspring look similar to the parent but not identical to them.