The Beginning of the Precambrian Era Is Marked by the Appearance

question 117

True/False

The beginning of the Precambrian era is marked by the appearance of the first life forms with hard parts.

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Definitions:

Viruses

Very simple, frequently pathogenic, microorganisms capable of replicating within living cells.

Chronic Obstructive Pulmonary Disease

A group of lung diseases characterized by obstructed airflow leading to breathing difficulty, often caused by long-term exposure to irritating gases or particulate matter.

Muscular

Relates to muscles or the muscular system, especially concerning strength, flexibility, or physical fitness.

Chronic Obstructive Pulmonary Disease

Conditions affecting the lungs, like emphysema and chronic bronchitis, that result in challenges in breathing.