For anyone fascinated by this topic, the book I, Mammal[1] by Liam Drew is highly recommended. A whole chapter is dedicated to the importance of placenta in evo

For anyone fascinated by this topic, the book I, Mammal[1] by Liam Drew is highly recommended. A whole chapter is dedicated to the importance of placenta in evolution of mammals, along with other chapters on other mammalian features like lactation, hair, locomotion, homeothermy etc., [1] https://www.goodreads.com/book/show/30038815-i-mammal https://www.goodreads.com/book/show/30038815-i-mammal