amniotes
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11 Terms
vertebrates
that are able to reproduce without water (eggs)
amniotic eggs have four specialized membranes
amnion, yolk sac, chorion, allantois
amnion
forms the fluid-filled cavity to protect the developing embryo (shock absorption)
yolk sac
nutrient source using vessels connected to embryo gut
chorion
site of gas exchange, allowing oxygen to enter but minimizing water lossalla
allantois
holds excreted embryonic wastes
reptiles
horny dermal scales, lack of gills, internal fertilization
mammals
body hair/fat for thermoregulation, presence of mammary glands for young (monotremes, marsupials, placentals)
monotremes
egg laying mammals
marsupials
pouched mammals
placentals (eutherians)
mammals with placentas to provide materials for development within the uterus
Note 
Flashcards (33)