Examlex
-In what part of the United States did brightly colored murals first begin to appear?
Morula
An early stage in embryonic development in animals, characterized by a solid ball of cells formed from the division of a fertilized egg.
Zygote
The initial cell formed when a sperm cell unites with an egg cell, representing the first stage in the development of a new organism.
Blastopore
The initial opening formed during early embryonic development that can develop into either the mouth or anus in animals.
Archenteron
The central cavity of the gastrula stage of embryonic development that is lined with endoderm; primitive digestive system.
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