no they do not. Mammals are divided into three groups; monotremes, marsupials, and placental mammals.
Yes they do, all Placental mammals do.
Dolphins are mammals, give live birth, so also have a placenta.
No, tuna fish do not have placentas. The placenta is part of mammal physiology, and fish are not mammals.
The placenta is for nourishing the embryo.
The young are nourished in the womb by the placenta.
No, pouched mammals do not have placenta.
no they do not. Mammals are divided into three groups; monotremes, marsupials, and placental mammals.
A complex placenta. Marsupials have a choriovitelline placenta, but it is not as well-developed as the placentas of placental mammals.
Most mammals are placental mammals: they develop in a placenta before birth. Marsupials also develop in a placenta, but they are delivered much earlier and the placenta is less developed. Monotremes develop within an egg, which is kept inside the mother for some time before it is laid. It hatches several days later.
Placental, same as all mammals, and pretty much Identical to us. (the number of layers in the placenta is different)
I THINK THAT A monotremes is the answer.
Yes and No. Felines are animals closely related to cats (technically excluding the "great cats" ... lions, tigers, etc. ... who are felids but not felines). Placental mammals are those whose gestation includes a placenta (basically, all mammals except the monotremes and marsupials).All felines are placental mammals, but not all placental mammals are felines. Humans, for instance, are also placental mammals.Placental mammals bear live young, (that includes cats) that are nourished in the mother's uterus through the embryonic organ (placenta) attached to the uterus wall. The term "placental mammals" is somewhat misleading because marsupials also have placentae but it is short lived in its part for fetal nourishment. In eutherians, as "placental mammals" are known scientifically depend on the placenta during the full developmental stage of the fetus.