Answer:
The earliest geological time period among the options given is the
[A. Cambrian.]
During the Cambrian period, which occurred approximately 541 to 485 million years ago, there was a significant development and diversification of complex life forms on Earth. This period is often referred to as the "Cambrian Explosion" due to the sudden appearance of a wide range of diverse organisms.
Before the Cambrian period, Earth was predominantly inhabited by simple, soft-bodied organisms. However, during the Cambrian period, there was a remarkable increase in the complexity and diversity of life, with the emergence of various marine species. Examples of organisms that appeared during this period include trilobites, brachiopods, and early arthropods.
In contrast, the Permian period followed the Carboniferous period and is known for the formation of extensive coal deposits. It is also marked by the Permian-Triassic extinction event, which led to the end of the Paleozoic Era.
The Jurassic period, occurring during the Mesozoic Era, is known for the dominance of dinosaurs. It followed the Triassic period and preceded the Cretaceous period.
The Quaternary period is the most recent geological time period, starting approximately 2.6 million years ago and continuing to the present day. This period is characterized by the presence of Homo sapiens (modern humans) and significant climate fluctuations, including ice ages.
In conclusion, the earliest geological time period among the options provided is the Cambrian. This period witnessed a rapid diversification of complex life forms on Earth, setting the stage for the subsequent development of various organisms.
Step-by-step explanation:
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