Question

. In the Proterozoic eon what major changes were happening on Earth?

Answer 1

Answer:

During the Proterozoic, the atmosphere and oceans changed significantly. Proterozoic rocks contain many definite traces of primitive life-forms—the fossil remains of bacteria and blue-green algae, as well as of the first oxygen-dependent animals, the Ediacara fauna. Oxygen is a by-product of photosynthesis.

Answer 2

During the Proterozoic eon, the atmosphere and oceans changed significantly.

Explanations

• Proterozoic eons, meaning "early life," are Archean eons, ranging from 2.5 billion to 541 million years.  

• During this time, most of the central part of the continent was formed and the plate tectonics process began.  
• Proterozoic is a geological era that represents the time just before complex life begins to spread to Earth.

• During the Proterozoic eon, eukaryotes (cells with specific nuclei) has first appeared in fossil records about 1.7 billion years ago.