<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:
No
Explanation:
Organisms have organs, so the organs are part of the organisms
Say that five times fast lol
Answer: True
Explanation:
The role of afferent neurons is to send the impulses from the central nervous system (and its sensory input received) to the rest of the body.
I think it’s C I hope it’s right I’m sorry if I’m wrong
