____________________ Refer to the Number of Different Ways in Which

question 187

Short Answer

____________________ refer to the number of different ways in which objects can be arranged in order.

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Definitions:

Neural Tube

The embryonic precursor to the central nervous system, which develops into the brain and spinal cord in vertebrates.

Cell Migration

The movement of cells from one area to another, often a part of processes such as wound healing and the development of organisms.

Gastrulation

A phase early in the embryonic development of most animals, during which the single-layered blastula is reorganized into a multilayered structure known as the gastrula.

Germ Layers

The primary layers of cells in an embryo (ectoderm, mesoderm, and endoderm) from which all tissues and organs develop.