an animal whose anus was formed from its blastopore?
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lower level animals IE protozoans, flagellates
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A mammal? Nah. An organism? Yep. All living things are organisms, it's just some are a tad more complex than others. If a shark was a mammal, then it would have to have shark boobies, right? Whoa - there's a scary picture... a shark with boobies. Kinda reminds me of my ex-wife....
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the zebra.  \n\nI don't have geological evidence, but I'm gonna say zebra because the horse as we know it didn't run free in the wild: it was made through breeding.  I have a feeling that the zebra and ancestor to the modern horse were around at the same time, and then horses were bred into being later in history.
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A hermaphrodite is an animal born with both male and female sexual organs.
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Diploblasty is a condition of the ovum in which there are two primary germ layers: the ectoderm and endoderm. Diploblastic organisms are organisms which evolve from such an ovum. Diploblastic animals include radiata.\n\nTriploblasty is a condition of the ovum in which there are three primary germ layers: the ectoderm, mesoderm, and endoderm. Additionally, the term may refer to any ovum in which the blastoderm splits into three layers. In higher and intermediate animals, all organisms arise from a triploblastic ovum. Triploblastic organisms are organisms which evolve from such an ovum.
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One of the features taken as evidence that two organisms share a common ancestor is the possession of a number of unique traits that are found in those organisms, and are not found in other groups of organisms.\n\nThe following is a (partial) list of the characters shared by all chordates (the phylum to which vertebrates belong)\n\n- Possession of a notochord (which is a dorsal axial rod of vacuolated muscular cells surrounded by a connective tissue which forms in the blastocyst from the roof of the archenteron).  The notochord functions as a skeleton and resists deformation when muscles contract.\n\n- Pharyngeal gill slits (originally for filter feeding, also for respiration)\n\n- Dorsal hollow nerve cord derived by invagination of ectoderm along the dorsal midline, sometimes with anterior expansion (brain)\n\n- Postanal tail (major locomotory organ in most chordates)\n\n- Subpharyngeal gland, which is secretory tissue in the endoderm of the pharynx floor (endostyle in protochordates, thyroid gland in 'higher' chordates)\n\n- Ventral heart\n\n- Segmented body with segmented axial muscles, axial skeleton, gill arches, nerves, aortic arches\n\n- Ectodermal ciliated canal (endocrine function, pituitary in 'higher' chordates)\n\nIn addition, there are several features unique to the the vertebrates:\n\n- Neural crest cells (arising from neural groove, become melanocytes, sensory neurons etc.)\n\n- Endoskeleton of bone and/or cartilage\n\n- 3 part brain\n\n- Muscular pharyngeal pump\n\n- Jointed internal skeleton (unique in Animal Kingdom)\n\n- Unsegmented gonads\n\n- Usually with a skeletal cylinder protecting the dorsal hollow nerve cord (i.e. vertebrae)\n\n- Pharynx is chiefly respiratory\n\n- Gas bladder for buoyancy control and respiration (in most)\n\n- Paired jaws (in most)\n\n- Paired appendages (in most)\n\n- Cranium protecting the brain (poorly developed in some)\n\nAll of these features are shared between all the vertebrates, from nasty lamprey and disgusting hagfish to cute kitty cats and arrogant humans to giant blue whales and extinct ankylosaurs.\n\nThe possession of all of these features suggests that these organisms share a common ancestor from which they inherited all these traits.
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An ameba. It is a single cell organism according to science book years ago. But I suspect the earlier answer as a virus is also correct.
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PROLLY A VAGINA CAUSE IT SMELLS LIKE FISH
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Its an axolotl, with an "a".
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An animal that has been frequently used in laboratory testing due to it's biological likeness to humans.\n\nsee also...\n\nhttp://encarta.msn.com/encyclopedia_761560421/Rhesus_Monkey.html
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Nudibranch.  So I could barf my intestines all over unsuspecting bystanders
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The male and female reproductive "tracts" are homologous.  This means that they're similar in structure and evolutionary origin, but are different in function.
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The first chicken was hatched from an egg of something that was not quite a chicken. That's evolution :-)
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All mammals have genitals like our own. Birds and reptiles have cloacas, which act as openings for the entire excretory and sexual systems.
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A swollen, glandular, saddlelike region in the epidermis of certain annelid worms, such as the earthworm, that secretes a viscous fluid to form a cocoon for their eggs.
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Animals are a major group of organisms, classified as the kingdom Animalia or Meta­zoa. In general they are multi­cellular, capable of locomotion, responsive to their environment, and feed by consuming other organisms. Their body plan becomes fixed as they develop, usually early on in their development as embryos, although some undergo a process of metamorphosis later on.\n\nThe word "animal" comes from the Latin word animal, of which animalia is the plural, and ultimately from anima, meaning vital breath or soul.\n\nCharacteristics\nAnimals have several characteristics that set them apart from other living things. Animals are eukaryotic and multicellular, which separates them from bacteria and most protists. They are heterotrophic, generally digesting food in an internal chamber, which separates them from plants and algae. They are also distinguished from plants, algae, and fungi by lacking cell walls.\n\n\nStructure\nWith a few exceptions, most notably the sponges (Phylum Porifera), animals have bodies differen­tiated into separate tissues. These include muscles, which are able to contract and control locomotion, and a nervous system, which sends and processes signals. There is also typically an internal digestive chamber, with one or two openings. Animals with this sort of organization are called metazoans, or eumetazoans when the former is used for animals in general.\n\nAll animals have eukaryotic cells, surrounded by a characteristic extracellular matrix composed of collagen and elastic glycoproteins. This may be calcified to form structures like shells, bones, and spicules. During development it forms a relatively flexible framework upon which cells can move about and be reorganized, making complex structures possible. In contrast, other multicellular organisms like plants and fungi have cells held in place by cell walls, and so develop by progressive growth. Also, unique to animal cells are the following intercellular junctions: tight junctions, gap junctions, and desmosomes.\n\nReproduction and development\nNearly all animals undergo some form of sexual reproduction. Adults are diploid or polyploid. They have a few specialized reproductive cells, which undergo meiosis to produce smaller motile spermatozoa or larger non-motile ova. These fuse to form zygotes, which develop into new individuals.\n\nMany animals are also capable of asexual reproduction. This may take place through parthenogenesis, where fertile eggs are produced without mating, or in some cases through fragmentation.\n\nA zygote initially develops into a hollow sphere, called a blastula, which undergoes rearrangement and differentiation. In sponges, blastula larvae swim to a new location and develop into a new sponge. In most other groups, the blastula undergoes more complicated rearrangement. It first invaginates to form a gastrula with a digestive chamber, and two separate germ layers - an external ectoderm and an internal endoderm. In most cases, a mesoderm also develops between them. These germ layers then differentiate to form tissues and organs.\n\nAnimals grow by indirectly using the energy of sunlight. Plants use this energy to convert sunlight into simple sugars using a process known as photosynthesis. Starting with the molecules Carbon Dioxide (CO2) and Water (H2O), photosynthesis converts the energy of sunlight into chemical energy stored in the bonds of Glucose (C6H12O6) and releases Oxygen (O2). These sugars are then used as the building blocks which allow the plant to grow. When animals eat these plants (or eat other animals which have eaten plants), the sugars produced by the plant are used by the animal. They are either used directly to help the animal grow, or broken down, releasing stored solar energy, and giving the animal the energy required for motion. This process is known as glycolysis.\n\n\nOrigin and fossil record\nAnimals are generally considered to have evolved from flagellate protozoa. Their closest living relativ
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There is (Or was, it may be extinct.) a frog that\ntook its eggs into its mouth for brooding, and\nreleased fully formed small frogs when they had\ndeveloped.  However, the eggs were released in\nthe usual way from the cloaca before being taken\ninto the mouth.  There are marine animals, such as\nsea anemones which release their eggs through the mouth because they have no other opening.