AP Bio Chapter 34

	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