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Which of these major events occurred during the Precambrian time? A. Landmasses were all below water. B. Cyanobacteria filled the water and air with oxygen. C. Trilobites became extinct. D. People lived on Earth.

Respuesta :

The beginning of the Precambrian period starts with the formation of Earth about 4.5 billion years ago and ends at the first sign of complex life about 540 million years ago. Though the Precambrian Period is often referred to as a period, it's actually the only supereon, which means that it spans multiple eons.

The major events occurred during the Precambrian time was Cyanobacteria filled the water and air with oxygen. Thus the option (B) is correct.

What is Precambrian time?

Precambrian time or the era refers to the time period when the earth began to form about 4.6 billion years ago. The Precambrian period is extended from 4.6 billion to 541 million years i.e. the beginning of the Cambrian period.

At this period the earth started cooling and solidifying which later led to the formation of the huge landmasses. Molten Lava also began to cool down into the solid crust.

Due to the Cyanobacteria present in the oceans it filled the oxygen into the water and it developed the atmosphere. Thus the option (B) is correct.

Learn more about Cambrian period here:

https://brainly.com/question/8196354

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