The Evidence That Scientists Currently Have Suggests That Life on Earth

question 53

Multiple Choice

The evidence that scientists currently have suggests that life on Earth _____.

• A) began in the water
• B) first evolved around 3,500 million years ago
• C) began as single-celled organisms
• D) first evolved in the water around 3,500 million years ago
• E) all of these

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Definitions:

Nerve Impulses

Electrical signals that travel along the nerves, enabling communication between the brain and the body.

Nodes of Ranvier

Gaps in the myelin sheath of nerve fibers where the axon is exposed, allowing for the rapid conduction of nerve impulses.

Nerve Impulses

Electrical signals that travel along nerve fibers, enabling communication between neurons in the body.

Myelin

The insulating layer around many nerve fibers, essential for the fast transmission of electrical impulses along nerve cells.