I believe it’s Precambrian.
Answer: Because if you many different habitats are continuously destroyed than the food chain is ruined in those habitats from many animals going endangered.
Answer:
The Simplest of Eukaryotic Cells. Microsporidia are intracellular parasites that infect most other eukaryotic cells, although arthropods are the most commonly parasitized. They are the simplest and smallest eukaryotic cells and thus represent a textbook example of reductive evolution [1].
Link: https://designmatrix.wordpress.com/2009/03/10/the-simplest-of-eukaryotic-cells/
D. Earthquakes, volcanoes, and hot springs release energy from Earth's interior.
Answer:A. It was a period of increased solar radiation
Explanation: I took a test and I got it right