Yes, humans can mark territory with urine, but it is not as common or instinctual as it is in animals. Some individuals may engage in this behavior for various reasons, but it is not a widespread practice among humans.
In very rare cases it is possible for humans to contract the disease pasteurellosis. Pasteurellosis is highly contagious among rabbits.
Researchers have discovered that large numbers of North American cats carry antibodies for the disease (meaning that the cats have been infected at some point in their lives).
It is also spread by germs. But orignally this disease can be spread by the cells throughtout the body.
Cannibalism is the act of eating your own kind. Cannibalism is widespread among animals because there are often food shortages.
Protists are single-celled eukaryotes.
Hand, foot, and mouth disease is a viral infection that typically affects humans, especially young children. There is no evidence to suggest that it can be transmitted to dogs or other animals. It is important to practice good hygiene such as regular handwashing to prevent the spread of the disease among humans.
There's Giardia and Amoeba, among others.
Organ
No, "widespread" is an adjective that describes something that is happening or found over a large area or among many people.
Although cats are popular pets found in about 30% of American households, human infection appears to be rare.
Kuru reached epidemic proportions among tribal members in the 1950s. Since the practice of cannibalism was halted, the disease has essentially disappeared. Zero to 10 cases of kuru are diagnosed each year.