Examlex
The specialization of stem cells into various cellular types is called ________.
Human Evolution
The lengthy process of change by which people originated from apelike ancestors, involving developments in physical, social, and cultural traits.
Deuterostomes
A major division of the animal kingdom in which the anus develops from the first opening in the embryo, followed by the mouth.
Echinoderms
Marine animals characterized by radial symmetry and a unique water vascular system, which includes species such as sea stars, sea urchins, and sea cucumbers.
Embryonic Stages
Phases of development that an embryo goes through from fertilization to birth.
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