I think the answer is the 2nd one
The MAC (Medium Access Control) layer is responsible for this.
When considering changing the content of a cell you should
press CTRL + Z to leave the cell as it originally was.
To undo an action just:
Press Ctrl+Z until you've fixed your mistake.
Or press Alt+Backspace to do the same thing.
If you prefer your mouse, click Undo on the Quick
Access Toolbar.
Answer:
The eye has a very focused view that is optimised for perceiving movement.Human cannot see clearly outside an -5 degree cone of foveal vision.
Main points are key ideas that support a thesis and helps an audience understand and remember what is most important about a speaker's topic, while sub points are supporting points like <span><span>examples, definitions, testimony, and statistics that support or illustrate a speaker's main points.
</span>A preview is a list of main points and sub-points of a topic to include in a presentation</span>
