Cell divisions, migrations and re-arrangements produce two or three primary tissues or germ layer is:

Explanation

Cell divisions, migrations and re-arrangements produce two or three primary tissues or germ layer is gastrulation. Gastrulation is a key stage in the early development of multicellular organisms, particularly those with bilateral symmetry. It follows the cleavage stage and marks a critical process in which a single-layered blastula is transformed into a three-layered structure called the gastrula. Gastrulation is essential for the subsequent development of various tissues and organs in the organism.During gastrulation, cells within the embryo undergo movements and differentiation to give rise to the three primary germ layers: the ectoderm, mesoderm, and endoderm. These germ layers are fundamental in the development of various body structures.Gastrulation is a fundamental process in embryonic development because it establishes the body plan of the organism and lays the foundation for the formation of specialized tissues and organs. It occurs in various animal species and is a central focus of study in the fields of embryology and developmental biology. Understanding gastrulation is crucial for unraveling how different species develop and form their unique anatomical structures.