What do you need help with? This isn't really a question.
Answer:
Retraction.
Explanation:
When someone suffers from lower eyelid retraction, it means that their lower eyelid has actually been pulled downward which is an example of a scary face.
Another example is by grabbing your bottom lip with your top teeth. When you do this, your mandible moves in an anterior direction.
Answer:
Transcribing DNA into mRNA
Explanation:
The geneome of most DNA-containing viruses that infect eukaryotic cells is transported in the cell nucleus, where the cellular DNA is, of course, also found. Once inside the cell, the viral DNA interacts.
(Hope this helps!!)
Answer:
<em>The correct option is A) increase in atmospheric O2</em>
Explanation:
The nerve cells and the muscle cells suggest that the the presence of oxygen in the atmosphere was an adaptive radiation which brought the existence of different animals. The conditions became favorable for different animals to survive on Earth only when the availability of oxygen improved in the atmosphere. As animal cells like the muscle cells require a constant supply of oxygen, we can hence say that increase in atmospheric oxygen was the adaptive radiation for supporting many group of animals.