Why Do Some Scientists Think That the Idea of the Habitable

question 10

Multiple Choice

Why do some scientists think that the idea of the habitable zone as a fixed distance range from a star is too restrictive?

• A)Changes in stars' brightness might change the position of habitable zones.
• B)Many forms of life do not require liquid water.
• C)Planets may not always keep a constant distance from their star.
• D)Liquid water can be maintained by tidal heating.

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Definitions:

Neurofibrillary Tangles

Twisted masses of fibers within nerve cells, found in the brains of patients with neurodegenerative diseases such as Alzheimer's.

Alzheimer Disease

A progressive neurological disorder characterized by memory loss, cognitive decline, and personality changes, resulting from the degeneration of brain cells and neural connections.

Parkinson Disease

A neurological disorder characterized by tremors, stiffness, and slow movement, resulting from the loss of dopamine-producing brain cells.

Globus Pallidus

A subcortical structure within the brain involved in the regulation of voluntary movement.