Biology, 11.04.2021 18:30 020020

Scientists have provided support that Earth is approximately 4.5 billion years old. Up until about 3.8 billion years ago, no life existed in this harsh environment. Not until solid rock
formed and volcanoes filled the atmosphere with water vapor and gases was life able to arise.
These volcanic gases contained the carbon, hydrogen, oxygen and nitrogen needed for life,
but also contained toxic gases such as methane and ammonia. Which of the following
organisms best represent the earliest life forms?

A. Very simple multi-cellular organisms that relied on photosynthesis to produce energy.

B. Archaea-like photosynthetic organisms that lived in the available water.

C. Worm-like organisms that were able to live on the rocky surface.

D. Large flying insects that were able to obtain nutrients from the minerals in rocks.

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Scientists have provided support that Earth is approximately 4.5 billion years old. Up until about...

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