Primates
Fish - amphibians - reptiles; and from the reptiles birds and mammals.
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The correct order in which vertebrates evolved is fish, amphibians, reptiles, birds, and then mammals. Fish were the first vertebrates to appear, followed by amphibians that adapted to life on land. Reptiles evolved next, leading to the development of birds and eventually mammals. Thus, the correct sequence is fish, amphibians, reptiles, birds, and mammals.
1:fish 2: amphibians 3: reptiles 4: birds 5: mammals
The order Monotremata, or monotremes, are egg-laying mammals.
The order of the egg-laying mammals is Monotremata.The monotremes include just the platypus and the echidna.
The five classes of vertebrates (fish, amphibians, reptiles, birds, mammals) evolved in the following order: fish appeared first, followed by amphibians, then reptiles, birds, and finally mammals. Each class adapted and diversified to exploit different environments and ecological niches over millions of years.
The Rodentia order of mammals.
Just a thought but a few characteristics would be Warn Blooded Live Young (not exclusive to mammals but a big characteristic, I think one or two mammals lay eggs but that's it) Air Breathing (definitely not specific to mammals but distinct from alot of sea creatures) Produce Milk (I think this is exclusive to mammals) 4 Chambered Heart Belong to the order of Cetacia (Whales, Dolphins and Porpoises), a mammalian placental order
Yes, by definition cetaceans are an order of mammals.
The largest order of mammals, with about 1,700 species, is rodents. Bats are second with about 950 species.
Marine Mammals Order : Pinnipedia