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| An internal membrne which enloses the embryo in an amniote egg. |
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| A shelled egg which is independant of a water source. |
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| A tissue that resembles bone but is less brittle nad more flexible. |
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| milk-producing glands used by all female mammals to suckle theri young. |
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| The group of mammals in which the period of uterine development is short and the young are born at a very immature stage, so they crawl to the nipple until complete development |
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| The group of mammals which lays eggs. |
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| A hollow neural structure which develops a thickening at its anterior end and becomes a brain. |
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| A stiff but flexible rod that extends the length of hte body and provides an attachment site for muscles. |
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| Respiratory openings located in the pharynx that may appear only durng an early stage of development. |
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| The uterine structure that functions in gas, nutrient, and wastte exchange between the circulatory sytems of the mother and embryo. |
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| An extension of the body past the anus. |
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