<u>Answer</u>:
Option 1.Eukaryotic cells first seen
Option 5. oxygen builds up in the atmosphere
<u>Explanation</u> :
- The name <em>Proterozoic eon</em> is derived from a Greek word which means earlier life.
- This eon represents the time just before complex life started proliferating on earth.
- One of the most important events that took place during this eon was <em>build up of oxygen in the atmosphere</em>.
The fossil evidence also shows the occurrence of <em>advanced single-celled eukaryotes.</em>
<em>So the events that define the Proterozoic eon are eukaryotic cells first seen and oxygen build up in the atmosphere. </em>
Answer:
There are four main stages in the water cycle. They are evaporation, condensation, precipitation and collection.
Explanation:
The process of copying genetic info stored in DNA to mRNA is Transcription
Answer:
The answer is something I am not sure but you can just ask someone else from braninly
Explanation:
You can do this by using the search icon on the top right corner of your screen
Well fossils can tell you a lot about the age of the rock it was found in, and an index fossil are used to used to define periods of geologic time.
