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| Terrestrial vertebrates- reptiles, birds, and mammals, that deposit amniotic eggs, that is eggs protected by a water tight membrane and a shell |
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| Members of the invertebrate phylum Arthropoda;characterized by a segmented body, an exoskeleton, and jointed appendages |
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| Molluscs in which the head is prominent and the foot has been modified into tentacles; examples are octopuses and squids. Cephalopods have a reduced or absent shell and possess the most advanced nervous system of the invertebrates. |
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| Bilaterally symmetrical animals with defined tissues in which the gut develops from back to front; the anus forms first, and the second opening formed is the mouth of the adult animal. |
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| Organisms that rely on the heat from an external source to raise their body temperature and seek the shade when the air is too warm |
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| A rigid external covering such as found in some invertebrates, including insects and crustaceans. |
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| Molluscs that are members of the class Gastropoda; most have a single shell, a muscular foot for locomotion, and a radula used for scraping food from surfaces; examples are snails and slugs. |
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| Fish species characterized by two pairs of sturdy lobe-shaped fins on the underside of the body. |
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| Mammals in which, in most species, after a short period of embryonic life in the uterus, the young complete their development in a pouch in the female |
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| Present-day mammals that retain the ancestral condition of laying eggs; monotremes are so called because they have a single duct, the cloaca, which the reproductive system, the urinary system and the digestive system open into. |
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| A rod of tissue from head to tail that stiffens when body when muscles contract during locomotion; primitive chordates retain the notochord throughout life, but in advanced chordates it is present only in early embryos and is replaced by the vertebral column. |
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| Slits in the pharyngeal region, between the back of the mouth and the top of the throat, for the passage of water for breathing and feeding |
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| Mammals in which the developing fetus takes nourishment from the transfr of nutrients from the mother through the placenta, which also supplies respiratory gases and removes metabolic waste products. |
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| A tail that extends beyond the end of the trunk a point that is marked by the anus; a characteristic of chordates. |
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| Bilaterally symmetrical animals with defined tissues in which the gut develops from front to back; the first opening formed is the mouth of the adult animal. |
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| In complete metamorphosis, the second stage of insect development, in which the larva is enclosed in a case and its body structures are broken down into molecules that are reassembled into the adult form. |
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| A body structure like that of a wheel, or pie, in which any cut through the center would divide the organism |
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| Fish species characterized by rigid bones and a mouth at the apex of the body; they are so called because their fins are lined with hardened rays[image] |
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| Describes organisms that are fastened in place, such as adult mussels and barnacles. |
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| An organism with four legs, all terrestrial vertebrates are tetrapods |
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| The characteristic of bearing young alive, giving birth to babies (rather than laying eggs) lat; vivus=alive + parere to bear |
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