Examlex
When you open a combination lock, you first turn the lock to one number. The reinforcement for that response is the opportunity to turn it to the second number, which is reinforced by the opportunity to turn to the third number, which opens the lock. This series of behaviors illustrates the concept of
Ectoderm
The outer germ layer of the early embryo; gives rise to the skin and nervous system. Compare with mesoderm and endoderm.
Protostomes
Animals that belong to the Protostomia, one of the major animal clades. Include the annelids, arthropods, and mollusks. Compare with deuterostomes.
Deuterostomes
A major group of animals characterized by their embryonic development, in which the anus forms before the mouth.
Spiral Cleavage
A distinctive spiral pattern of blastomere production in an early protostome embryo. Compare with radial cleavage.
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