Examlex
____ are dome-shaped structures composed of layers of early cells and sediments.
Allantois
An extraembryonic membrane of reptiles, birds, and mammals that stores the embryo’s nitrogenous wastes; most of the allantois is detached at hatching or birth.
Nitrogenous Wastes
Metabolic waste compounds that contain nitrogen, commonly produced by the breakdown of proteins and nucleic acids in organisms.
Umbilical Cord
A flexible cord-like structure containing blood vessels, connecting the fetus to the placenta during pregnancy.
Allantois
An embryonic membrane in reptiles, birds, and mammals that is involved in respiration and excretion.
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