chapter 34 vertebrates

shelled egg in which an embryo develops within a fluid-filled amniotic sac and nourished by yolk.

external sources provide most ofthe heat for temperature regulation

internal sources that provide most of the heat for temp regulation

hard skelleton burried within the soft tissues of an animal.

Placental mammal; young complete their embryonic development within their nucleus.

exocrine glands that secret milk to nourish young.

a mammal whose young complete their embryonic development in side a maternal pouch called the marsupium

in aquatic, a protective body flap that covers and protects the gills.

structure in pregnant uterus for nourishing a viviparous fetus with the mother's blood supply.

amniotes with mammary glands

An aqueous osteichthyans, an air sac that enables the animal to control its boyancy in the water.

A vertebrate with 2 pairs of limbs

refering to a type of development in which young hatch from eggs that are retained outside the mother's body.

young are borne alive after having being nervous in the uterus by blood from the placenta.