EVERYDAY SCIENCE

Detailed explanation-1: -The eutherian or ‘placental’ mammals, like humans, make up the vast majority of today’s mammalian diversity. Eutherians all have a chorioallantoic placenta, a remarkable organ that forms after conception at the site where the embryo makes contact with the lining of the mother’s uterus (Langer, 2008).

Detailed explanation-2: -Placental mammals account for the majority of modern mammal species alive today.

Detailed explanation-3: -Insectivores (Insectivora, Macroscelidea, Scandentia) Insectivores are considered the most primitive of all placental mammals and are believed to be the ones from which present day mammals have evolved.

Detailed explanation-4: -Three examples of placental mammals are African elephants, baboons, and squirrels. These three examples have mammary glands, give birth to live mammals, have fur or hair, are warm-blooded and are vertebrates.