___________Refers to Countries with at Least a Moderate Level of Economic

question 74

Multiple Choice

___________refers to countries with at least a moderate level of economic development and a moderate standard of living.

• A) First World
• B) Second World
• C) Third World
• D) Fourth World

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Definitions:

Gastrulation

During the early stages of embryonic evolution in a wide range of animals, the simple, single-layered structure called a blastula rearranges itself into a complex, multilayered formation known as the gastrula.

Embryonic Disk

A key structure in early embryonic development, from which the embryo begins to form and differentiate into various tissues and organ systems.

Germ Layers

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

Y-Linked

Gene located on a Y chromosome.