What Macroevolutionary Concept Is Considered Controversial by Some People

question 68

Multiple Choice

What macroevolutionary concept is considered controversial by some people?

• A) the appearance of new traits in existing populations
• B) the common descent of all organisms from one ancestral cell
• C) the concept of species being subdivided into separate populations
• D) the concept that genes can vary spontaneously

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Definitions:

Ectoderm

The outermost layer of cells in the developing embryo of an animal, giving rise to the skin and nervous system.

Germ Layer

Layers of cells in the early embryo that develop into all the organs and tissues of the body, including the ectoderm, mesoderm, and endoderm.

Bone And Cartilage

Connective tissues in animals; bones provide structural support and protection, while cartilage reduces friction and acts as a cushion between joints.

Ectoderm

The outermost of the three primary layers in an embryo, from which the skin, nervous system, and sense organs develop.