Examlex
A _____ is a device that records total number of behavioral responses.
Germ Layers
In animals, three embryonic tissue layers: endoderm, mesoderm, and ectoderm
Echinoderms
A phylum of marine animals characterized by radial symmetry, a calcareous skeleton, and a water vascular system, includes starfish and sea urchins.
Primitive Groove
A depression or furrow on the surface of an early embryo that is involved in the process of gastrulation, leading to the development of different layers.
Gastrulation
An early embryonic phase in animal development during which the single-layered blastula is reorganized into a multilayered structure known as the gastrula.
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