The Early Embryonic Stage That Is a Solid Sphere of Cells

question 139

Short Answer

The early embryonic stage that is a solid sphere of cells is the ____________________.

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Definitions:

Three-chambered Heart

A type of heart structure found in amphibians and some reptiles, consisting of two atria and one ventricle.

Amphibians

A class of cold-blooded vertebrates that includes frogs, toads, salamanders, and newts, which typically have a life cycle that includes both aquatic (larval) and terrestrial (adult) stages.

Birds

Warm-blooded vertebrates that are characterized by feathers, beaks, and laying hard-shelled eggs, and they have a high metabolic rate and a lightweight skeletal system.

Monotremes

A group of egg-laying mammals that includes the platypus and echidnas.