Eukaryotic cells are cells that have all of the different kinds of organelles, like the nucleus.  Also they at the cells that make up animals.
        
                    
             
        
        
        
The evolutionary selection process for glycogen metabolism<span> reflects the requirements of rendering large amounts of glucose into an osmotically stable but readily soluble </span>substrate<span> for rapid mobilization. Therefore glycogen </span>serves<span> as a glucose reserve and </span>substrate<span> buffer for local </span>energy<span> demand.</span>
        
             
        
        
        
<h2>The rotational motion of the forearm</h2>
Explanation:
- The two large bones of the forearm, one being the Ulna and the other is radial bone or radius.
- The Radius is larger in size than the Ulna.
- Radius is prism shaped, little curved longitudinally long bone.
- The part of two joints known as elbow and wrist comprised the Radius.
- Radius link with the capitulum of the humerus at the elbow region.
- Radius forms a joint at the wrist region with the ulna bone.
 
        
        
        
I'm not sure if it's the "best" example but.
If your blood tempature is low, the hypothalamus will issues reflex commands that make your body shiver. If you are hot, you will sweat is the opposite of this. 
Another example is, if your blood contains pyrokines then you might have an infection so you begin to run a fever as your body's way to kill the pathogen at the direction of the hypothalamus.
Hope these examples help! 
        
                    
             
        
        
        
We need the options in order to answer