1. to ensure continuity and preservation of genetic material.
2.semi conservative
3.a DNA polymerase : unzip the DNA strand.
b Helicase : unwind dna strand
4.during the s stage of interphase
5. Nucleus 
 
        
             
        
        
        
The difference between the meanings of combining forms spondyl/o and vertebr/o is spondyl/o and vertebr/o both mean vertebra. There is no difference because they are both vertebra.
Spondyl/o is a combining form meaning vertebrae. The two combining forms for vertebrae bones of the spine, are vertebr/o and spondyl/o.
        
             
        
        
        
I think this is answer but i'm not sure it is right or wrong   3+14= 17
        
             
        
        
        
Striated. But the lithosphere is made up of metamorphic, sedimentary, and igneous