Well if it's been left on a pad or whatever for a while then basically because that's what it is. Period blood is in fact, mostly the lining of the uterus (which had thickened in preparation for pregnancy) being shed. If it's been sitting out for a while then it will, essentially, start to rot. It will harbor LOTS of bacteria, so you should change your pad often. Or use tampons, which aren't exposed to the air so don't "go bad" as quickly.
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A bottlenose dolphin is an animal that can live in the water for about sixteen hours at a time. Dolphins are able to stay submerged for long periods by slowing their heart rate and redirecting blood flow to essential organs.
Worms consuming the blood of an animal
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, injecting animal blood into a human bloodstream would not cause them to turn into an animal. The human body would recognize the foreign blood cells as not its own and would likely trigger an immune response to remove them.
Vampire bats live on blood.