Yes. Most animals don't have an appendix. Apes and monkeys have an appendix like a human's (a long tube), and rabbits and a few species of other rodents have a more sack-like appendix. None of the other animals has one.
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Cows have four stomachs.
Human blood contains different types of cells (red blood cells, white blood cells, and platelets) compared to animal blood. Additionally, human blood is rich in hemoglobin, which carries oxygen, while some animals have other proteins that serve a similar function. The composition and structure of blood components also vary between human and animal blood.
No, animal semen cannot impregnate female humans. Each species has reproductive barriers preventing the successful fertilization of eggs between different species.
Cats do not have seminal vesicles therefore there is no difference.
Anthrozoologists study the interaction and relationship between humans and animals, including the psychological, social, and physical benefits of this interaction. They may also focus on animal behavior, welfare, and the impact of human-animal interactions on both parties.