Yes they can and some do.
Poop (feces) are the waste products of digestion and certain parts of cell respiration. The food people and animals (including cats) eat is not completely utilized in the digestion process and it passes out of the intestinal tract in the form of poop! The less efficient the animal at digesting it's food the more feces it produces...that's why cows, horses and other animals produce a lot more poop than other animals.
yes. other cats can step in that cats poop, the cat can lick the other cat, or another cat can step in the other cats pee
yes it attracs other cats Mostly it is spray or urine though.
Ask your neighbor to move where they feed the cats or to pick up the poop themselves. If they don't, tell them you are going to file a police report.
The cat's natural instinct is to cover up their scent. In the wilds of nature, they would be safer in covering up their scent so other animals cannot detect them.
It does what other fish do, swim, eat, poop, pee, die.
Their bodies decay, and are also eaten by other animals, which in turn poop the nutrients into the soil.
All animals poop
No, they use burrows made from other animals.
to rip other animals hearts and insides out while they poop
Absolutely not! It may even attract them. But it would tend to keep other animals away - like cats and rabbits. Any type of animal that a dog chases will realize there is a dog there and keep away.
Most do, a few don't.