Million of bacteria grow in our gut and each have their own set of genes , that helps them to survive acidic environment of the gut. They can have both beneficial and harmful effect to your health. 
While the bacteria in lungs causes symptoms similar to the cold or flu, it can be more severe and typically last longer. Immune system will typically be able to clear a viral lung infection over time. Infections can be cured by using antibiotics also . 
On the other hand bacteria on skin can survive up to 20 minutes .Human skin also act as barrier that limits invasion and growth of pathogenic bacteria. Human body has a lot of defenses to keep the bad bacteria from coming in too far through these openings.
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Answer:
a. the segmented body plan of the annelids
Explanation:
- lophotrochozoan is a taxonomy of animals that includes annelids, bryozoans, and brachiopods. 
- This taxonomy of creatures was defined in 1995 as the last ancestor of the taxa of worms, mollusks, and annelids. Their classical definition depends on the topology of the spiral tree of life.
- Annelids have a segmented body part wherein the external morphological features are repeated in every body segment. It allows the animal to become bigger and makes their movement more fat and efficient.
 
        
                    
             
        
        
        
All prokarytoic cells replicate through binary fission.
        
                    
             
        
        
        
While it is still in the nucleus in order to become a mature mRNA. The mature mRNA is exported from the nucleus to the cytosol, where it is translated at a ribosome to make a polypeptide.