It Is Commonly Thought That Life Originated in Hot Waters

question 68

Multiple Choice

It is commonly thought that life originated in hot waters near marine hydrothermal vents. Which of the following provides evidence in support of this hypothesis?

• A)Thaumarchaeota have high abundance in deep ocean waters.
• B)Euyarchaeota are extremely diverse.
• C)Some bacterial lineages also have thermophilic members.
• D)Early diverging branches on the archaeon tree gave rise to Thaumarchaeota.

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Definitions:

Ectoderm

The outermost layer of cells or tissue of an embryo in early development, giving rise to the epidermis and nervous system among others.

Germ Layer

One of the three primary layers of cells (ectoderm, mesoderm, endoderm) in the early embryo that develop into specific organ systems.

Nervous System

A complex network of nerve cells and fibers that transmits nerve impulses between parts of the body, coordinating and controlling bodily functions.

Ectoderm

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