Labels:text | screenshot | circle OCR: NESTS AND EGGS INSIDE AN EGG A HARD SHELL surrounded, supported, and protected an inner "pool" in which the embryo developed. The "pool" CHORION contained three membranes: the tough chorion covered the shell's ALLANTOIS interior; the allantois enclosed a sac that stored the embryo's waste and carried oxygen to the EMBRYO embryo; and the amnion formed a cushion around the embryo. AMNION HARD SHELL Unlike their amphibian ancestors, dinosaurs laid PROTECTIVE hard-shelled eggs on land. SHELL
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