There are three main branches of mammals alive today, classified mostly on their reproductive system, monotremes lay eggs, marsupials have pouches, and placental mammals keep the kids inside for longe...There are three main branches of mammals alive today, classified mostly on their reproductive system, monotremes lay eggs, marsupials have pouches, and placental mammals keep the kids inside for longer. Much of what it means to be human is shared with all mammals.
There are three main branches of mammals alive today, classified mostly on their reproductive system, monotremes lay eggs, marsupials have pouches, and placental mammals keep the kids inside for longe...There are three main branches of mammals alive today, classified mostly on their reproductive system, monotremes lay eggs, marsupials have pouches, and placental mammals keep the kids inside for longer. Much of what it means to be human is shared with all mammals.