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| a longitudinal, flexible rod located b/w the gut and nerve cord | ||
| group of cells that develop from the nerve cord and can form portions of the brain & skull, certain sense organs and nerve fibers contributes to formation certain skeletal components | ||
| egg composed of shell and membranes that create a protected environment in which the embryo can develop out of the water | ||
| Fish sense organ which detects vibrations and movement in the water | ||
| term used to refer to animals whose eggs hatch outside the mother's body | ||
| producing living young from eggs that hatch within the body | ||
| vertebrate animals having four feet, legs or leglike appendages | ||
| term used to refer to animals that bear live young that are nourished directly by the mother's body as they develop | ||
| lacking an internal mechanism for regulating body heat | ||
| describes a process in which heat is absorbed from the environment | ||
| an air-filled sac near the spinal column in many fishes that helps maintain buoyancy | ||
| A protective flap that covers the gills of fishes | ||
| a muscular cavity at the end of the large intestine through which digestive wastes, urine, and eggs or sperm leave the body | ||
| group of flightless birds | ||
| have a sternal keel | ||
| the vascular structure in the uterus of most mammals providing oxygen and nutrients for and transferring wastes from the developing fetus | ||
| mammals that lay eggs | ||
| Mammals whose immature offspring complete their development in an external pouch | ||
| hollow, dorsal to the notocord, brain and spinal cord develops from this primitive nerve cord | ||
| muscle that extends beyond anus, it contains skeletal elements and muscles, its a propulsive force in aquatic species | ||
| opening of pharynx to the outside through several pairs of slits, allows water to permit w/o traveling through digestive system | ||
| the part of the skeleton that includes the skull and spinal column and sternum and ribs | ||
| the portion of the skeleton that attaches to the axial skeleton and has the limbs attached to it |
