What Were Some of the Earliest Forms of Life on Earth

question 119

Multiple Choice

What were some of the earliest forms of life on Earth?

• A) land plants and insects
• B) corals and other bottom-dwelling sea creatures
• C) microscopic creatures that built mound-shaped structures called stromatolites
• D) sharks

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Definitions:

Diaphragm

A dome-shaped, flexible muscle separating the chest cavity from the abdominal cavity in humans, playing a major role in breathing.

Spasm

An involuntary sudden movement or convulsive muscular contraction.

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Hemoptysis is the medical term for coughing up blood or blood-streaked sputum from the lungs or bronchial tubes due to various respiratory conditions.