The Amniotic Egg (Grade 12 NSC Matric Life Sciences): Flashcards
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Evolutionary breakthrough that freed vertebrates from water
Evolutionary breakthrough that freed vertebrates from water
Amniotic egg
Membrane that forms protective sac around embryo
Membrane that forms protective sac around embryo
Amnion
Fluid that cushions embryo & prevents dehydration
Fluid that cushions embryo & prevents dehydration
Amniotic fluid
Membrane for waste storage & gas exchange
Membrane for waste storage & gas exchange
Allantois
Outermost embryonic membrane
Outermost embryonic membrane
Chorion
Structure containing food reserves for embryo
Structure containing food reserves for embryo
Yolk sac
Result of larger yolk supply in eggs
Result of larger yolk supply in eggs
More developed offspring at hatching
Shell prevents water loss while allowing this
Shell prevents water loss while allowing this
Gas exchange
Number of specialised embryonic membranes in amniotic egg
Number of specialised embryonic membranes in amniotic egg
Three
What amniotic egg enabled vertebrates to colonise
What amniotic egg enabled vertebrates to colonise
Terrestrial environments