Examlex
The amniotic egg was a key adaptation allowing vertebrates to make the transition to life on land where diffusion to/from a watery environment could not allow a developing embryo to meet its metabolic needs. Its three membranes are the _____, which surrounds the embryo in a watery sac; the _____, which sequesters metabolic waste away from the developing embryo; and the _____, which surrounds the embryo and other sacs.
Below
A term used to indicate a position lower than a specific reference point.
Deficient
Lacking in some essential component or quality, often related to nutrition, elements, or resources.
Abbreviation
A shortened form of a word or phrase.
Path
A track or way worn by foot traffic or formed by animal or human passage.
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