"Eukaryote" roughly translates as "truly nucleated" and refers to organisms with a membrane-bound nucleus. 
Such membrane-bound organelles are thought to have arisen via the invagination of the cell's own plasma membrane. 
Other organelles such as the mitochondria and the chloroplast are believed to have once existed as separate organisms, but which were engulfed by other cells, forming a symbiotic relationship.
 
        
             
        
        
        
Answer:
Grey and White Matter.
Explanation:
When looking at an image of trasnverse section of the spinal cord the grey matter is almost butterfly shapped and it has the central canal in the middle. The white matter is surrounding the butterfly shaped, grey matter. 
 
        
                    
             
        
        
        
Answer:
The picture is upside down
Explanation:
 
        
             
        
        
        
Answer:
open cluster
Explanation:
As the name suggests, an open cluster is a star cluster that is loose and disorganized.