No: dolphins are placental mammals.
The only monotremes are platypuses and echidnas.
Dolphins are mammals and, with the exception of monotremes, all mammals give birth to live young.
Yes. Dolphins are placental mammals because they do not have a pouch like most marsupials, and they do not lay eggs like the monotremes.
Yes, they do; the sub-class Eutheria (placental mammals) includes all orders of mammals except monotremes (platypuses and echidnas) and marsupials (opossums, kangaroos, etc.). Cetaceans (whales, dolphins and porpoises) are included.
Yes, monotremes are real.
All mammals except for monotremes are viviparous. Monotremes are platypuses and echidnas: therefore, any mammal that is not a platypus or echidna is viviparous. Actual examples would be cats, dogs, horses, kangaroos, koalas, gerbils, gophers, beavers, dolphins, whales, rats, shrews, porcupines, armadillos, etc.
No a Blue Whale is Not a monotremes.
Monotremes never eat their young.
Monotremes are egg laying mammals, the platypus and the echidna are the only two monotremes.
Monotremes are mammals; therefore they have lungs, not gills.
Eutherians and monotremes are in the phylum Chordata.
No, monotremes do not have short internal development.
Monotremes are mammals that lay eggs, such as the Echidna and the Platypus.