Well they can begin as cosmic rays colliding with water molecules to create clouds. Hope this helps :)
Answer:
C. Multi-celled eukaryotic organisms began to diversify
Explanation:
The Proterozoic is an eon in which numerous important things occurred. There were multiple organisms that appeared in this eon. They were able to perform the process of photosynthesis which resulted in gradual pilling up of oxygen into the atmosphere, thus changing the composition of the atmosphere, and setting up the terrain for the future development of other organisms. It is an eon though in which there were only single-celled organisms, while the diversification of multi-celled eukaryotic organisms occurred in the next eon, the Phanerozoic.
The names of most enzymes end in "-ase." Some enzymes which have been known longer have older names that don't end in "ase." For example: pepsin, trypsin, and chrymotrypsin which are all enzymes localized in the digestive tract. hope u got the point
