What is the CLASS of a placental mammal?
966008
"Mamallia" is a class. The "placental", "monotremata" and "marsupial" distinction is at the subclass or the order level.
1099392
Domain.\n\nThe classification system goes Domain (Eukaryote, Bacteria or Archaea), Kingdom (Examples: Animals, Fungi), Phylum (Example: Arthopoda), Class (Example: Insecta), Order (Example: Carnivora), Family (Example: Felidae [cats]), Genus (Example: Homo), species (Example: Homo sapiens), sub-species (Example: Bison bison bison)
339373
There are two theories to explain how the Platypus has evolved into what it is today. The first (theory B) shows that relatives of monotremes formed their own evolutionary branch that was completely different from development of both marsupials and placentals. This change is thought to have occurred 135 million years go, the beginning of the Cretaceous period. The marsupials and the placentals divided at some point 135-65 million years ago.\n\nThe Second (theory A) was proposed by Gregory (1947) and was not popular until the 1970s. He said that between 135-65 million years ago, the placentals and marsupials separated to their own way then later the monotremes and the marsupials went their own way.\n\nEvidence for this theory is that the reproductive systems of monotremes and marsupials are extremely similar. The embryos of both have some stage of encased shells in the gestation period. The only difference is that monotremes have the encased shells throughout the entire gestation period, whereas marsupials only have the encased shells for about two thirds of the gestation period.\n\nAre you denying that evolution exists at all?
332375
Uterus and/or placenta
31274
Most, if not all mammals are vertebrates.  That simply means that they have a backbone or a spinal column.  An example of an invertebrate would be an octupus.  Hope this clears it up a bit!
1158484
Placentarian mammals do (not the platypus or equidna)
595823
Pot belly pigs are a breed of domestic pig, or Sus scrofa.  So their whole classification would be:\n\nKingdom Metazoa\nPhylum Chordata\n   Subphylum Vertebrata\nClass Mammalia\nOrder Artiodactyla\nFamily Suidae\nGenus Sus\nSpecies Sus scrofa
179015
Prototheria = the monotremes, only egg-laying mammals. Echidnas and platypus.\n\nMetatheria = the marsupials, mammals that carry their young in a pouch (well, some don't have pouches, the important characteristic is that their uterine gestation is very short).\n\nEutheria = placental mammals, with full development of the young within the mother's womb.
512190
Many bats also delay implantation after the eggs are fertilized.  There are also several mammal groups that have delayed fertilization, holding viable sperm for months until they are ready to begin gestation, and then an egg cell is fertilized.\n\nThis is possible in placental mammals where the egg cell is kept internal, and doesn't have a shell to protect it from the outside environment.  I doubt that it would be possible in, for example, birds, where once the egg is formed it's pretty much a done deal, and development goes ahead regardless of outside conditions.
552640
Super class of jawless vertebrates--Agnatha\n\nIt is further classified into 2 classes--\n\n1)Ostracodermi---extinct\n2)Cyclostomata -- the circular mouthed fishes. eg. Myxine(Hagfish) & Petromyzon(Lamprey).
57828
The whale. It is indeed a mammal.
939486
Gila monster-yes\nchameleon-yes\niguana-yes\nsquid-yes\nladybug-yes\noctopus-yes\ncentipede-yes\narmadillo-no\nbaboon-no\ngoat-no\nreindeer-no\ndonkey-no\nwolf-no\ntree frog-yes\ntarantula-yes\nbutterflies-yes\n\nHint: the armadillo,baboon,goat, reindeer,donkey, and wolf are mammals and they give birth to their young.  Now the only mammals that do lay eggs are the platypus and the two species of echidna.\n\nI hope this helps.
133297
1. Warm blooded\n2. Give birth to live young.\n3. Have mammary glands and nurse their young\n4. Have hair (yes, ehales and dolphins in utero have hair and some remains shortly after birth)\n5. Breath with lungs (while not a mammal exclusive trait it separates them from fish)\n\nOther marine mammals include seals, sea lions, manattees and sea otters.
4154
They are mammals, so yes, they do.\n\nFor photo see this site:\nhttp://images.google.com/imgres?imgurl=http://www.mun.ca/biology/scarr/Thalarctos_nursing.gif&imgrefurl=http://www.mun.ca/biology/scarr/Thalarctos_nursing.htm&h=382&w=535&sz=183&tbnid=meinX0SHbdcJ:&tbnh=92&tbnw=129&hl=en&ei=h2StQ9fkFKLMigH17IWzDw&sig2=_JsnD7U96scsfnTe0GHiVQ&start=21&prev=/images%3Fq%3DBears%2Bnursing%26start%3D20%26svnum%3D10%26hl%3Den%26lr%3D%26sa%3DN\n\nFor more info Google Bears+nursing
819951
Of course - they are mammals!  This site refers to relevant issues for reference:\n\nhttp://www.hedgehogworld.com/content/view/26/42/
326073
I would say the giraffe. They are beautiful and amazing creatures. Besides, if you can survive that 6 foot drop at birth then you must be a real trooper!
280517
the 7 living classes of vertebrate are distuingished mostly on the basis of their skeletal system\n\na) agnatha - consist of jawless fish that don't have scales ex. lampreys and hagfish\nb) chondrichthyes - consisting of hard rubber like cartilages ex. sharks and rays\nc) osteichthyes - bony fish ex. tuna, bass, salmon\nd) amphibia - lives under water and part land ex. frogs, toads, salamander\ne) reptilia - have lungs to breathe on land and skin does not need to be wet ex. turtles, lizards, alligators\nf) aves - include all birds\ng) mammalia - large animals ex. dogs, cats, humans