The principle of defense-in-depth<span> is that layered security mechanisms increase security of the </span>system<span> as a whole. </span>
        
             
        
        
        
A single cell RNA seq analysis identifies 25 population of epidermal cells . 
<h3>What is single cell transcriptomics used for?</h3>
Single cell transcriptomics are being used to create reference maps of healthy human tissues, organs and systems at single cell resolution. 
An essential model system for studying stem cells and tissue regeneration is the mouse epidermis with its hair follicles. To demonstrate how the cellular heterogeneity of the murine telogen epidermis is controlled at the transcriptional level, we used single-cell RNA-sequencing in this study. 25 different populations of interfollicular and follicular epidermal cells were identified by impartial clustering of 1,422 single-cell transcriptomes. With previously unheard-of resolution, our data allowed for the reconstruction of gene expression patterns during epidermal development and along the proximal-distal axis of the hair follicle. 
To Learn more about Transcriptomics refer 
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If they're more diverse they adapt faster to changing conditions meaning the population is less likely to diminish in the event of a change in their ecosystem.
        
             
        
        
        
Answer:
c. the abyssal plain contains the most biological diversity and the majority of all sea life because it is the ocean bed.
 
        
                    
             
        
        
        
Answer:
B) It breaks down polysaccharides such as starch.
Explanation:
Polysaccharides are long chains of monosaccharides like glucose joined together with glycosidic linkages. While plants can simply make glucose via photosynthesis, animals rely on glucose sourced from their diet. In animals, glucose is stored as glycogen; however, plant storage polysaccharides like starch are regularly broken down through digestion using enzymes. 
Enzymes are proteins which catalyze chemical reactions like the breakdown of large polysaccharides. Alpha amylase, an enzyme produced in the pancreas, is also found in human saliva; it catalyzes the hydrolysis, or breakdown of starch into glucose. Amylase acts on polysaccharides bonds at random points along the chain by splitting the α 1-4 glycosidic bonds. This produces maltose, dextrin and glucose; this glucose is used in ATP synthesis via <em>respiration, ethyl alcohol fermentation and lactic fermentation</em>.