Because human DNA is so very long (with up to 80 million base pairs in a chromosome) it unzips at multiple places along its length so that the replication process is going on simultaneously and more accurately.
        
             
        
        
        
It's either 3.5 or 1.2
There would be more evidence spread out through space to be noticed by scientists and it seems like a stretch to go as far back as 4 billion years ago.
(I mean really? That much before the DINOSOURS died? I don't think so)
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Hope this helps
Miri
 
        
             
        
        
        
Ok so, there's a total of 20 squirrels in all 
The fraction of brown squirrels would be 5/20 
5/20 as a decimal is .25 
To convert that to a percentage you multiply by 100: .25×100=25
So the correct answer is 25%
 
 
        
             
        
        
        
The structure of the lipid bilayer allows small, uncharged substances such as oxygen and carbon dioxide, and hydrophobic molecules such as lipids, to pass through the cell membrane, down their concentration gradient, by simple diffusion.