The word in the blank should be 'segregation' :)
        
                    
             
        
        
        
Answer:
a. The maternal copy of UBE3A is expressed and the paternal copy is silenced.
Explanation:
When UBE3A chromosome is in neurons, paternal allele is silent and maternal allele is expressed in process of genomic imprinting. In some cases UBE3A is expressed from both paternal and maternal chromosomes. The paternal chromosome is blue whereas maternal chromosome is magenta.
 
        
             
        
        
        
This is only one part of the answer, but its important: high-altitude O2 absorbs much energy from the sun (including radioactivity), which forms the ozone layer. this process protects delicate molecules important to life - most notably dna
        
             
        
        
        
Answer:
They protect the body from infectious agents.
And
They signal the immune system to destroy pathogens.
Explanation:
I HOPE THIS HELPS
 
        
             
        
        
        
Eukartyotic cells are found as bacteria or archaea. They are usually unicellular organisms. Has no nucleus. Has a very small cell size. 
Prokaryotic cells are found in plants and animals. They are multicellular. Has a nucleus. And has a much bigger cell  size.
They can have many of the same organelles, but prokaryotic cells are usually more advanced. They are both forms of life. They are both cells.