Understanding Placentalia: The Group of Mammals That Nourish Their Young with a Placenta

Placentalia is a group of mammals that includes all placental mammals, which are mammals that nourish their young with a placenta while they are in the womb. This group includes a wide range of animals, from small rodents to large whales, and includes many species that are familiar to us, such as humans, dogs, cats, and bears.
The placenta is an organ that develops in the uterus of a pregnant female and provides nutrients and oxygen to the developing fetus. It also removes waste products from the fetus and transports them to the mother's bloodstream. The placenta is essential for the development of the fetus and allows it to grow and thrive inside the mother's womb.
Placentalia is a clade, or a group of organisms that share a common ancestor and have evolved from a single species. This means that all members of Placentalia share a common ancestor and have evolved from a single species that had a placenta.
The name "Placentalia" comes from the Latin word "placenta," which means "flat cake." This refers to the flat, disk-like shape of the placenta, which is how it gets its name.
Examples of Placentalia include:
Humans
Dogs
Cats
Bears
Whales
Rodents (such as mice and rats)
Lemurs
Monkeys
Apes
These are just a few examples of the many species that are included in Placentalia. There are many other animals that belong to this group, and they can be found all over the world.