Examlex
In international studies of reading, mathematics, and science achievement, U.S. students typically perform
Deuterostomes
Organisms characterized by undergoing deuterostomy during embryonic development, where the anus forms before the mouth.
Blastopore
The opening formed during early embryonic development in animals, which can develop into the mouth or anus depending on the species.
Radial Cleavage
A pattern of animal embryonic development in which the divisions of the egg are symmetrical around the polar axis, typical of deuterostomes.
Vertebral Column
The spine, the rigid, bony structure in the midline of the back; composed of vertebrae.
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