Answer:
The food chain showing seven organisms can be drawn as follows:
Plants → grasshoppers → mice → frog → snakes→ eagles → decomposers
The plants are the primary source of food in a food chain or a food web. The animals which feed on plants will be termed as herbivores or primary consumers like the grasshopper. The organisms feeding on primary consumers will be the secondary consumers like mice.
An energy pyramid for three of the organisms can be shown as follows:
               mice (10 kilocalories)
                    ↑
         Grasshoppers (100 kilocalories)
                    ↑
        Plants ( 1000 kilocalories)
As the energy pyramid shows, only about 10% of the energy travels from one trophic level to another.
Explanation:
 
        
             
        
        
        
Parathyriod gland... their location is in your neck... actually there are 4 little parathyroid glands that are in the squre of thyriod gland
        
             
        
        
        
You can work out the concentration of H+ ions (denoted as [H+]) easily on a calculator if you know the pH, which you do. The easiest way to work out [H+] is to do 

. In your case, the maths here would be 

, which gets you an answer of 1.58x

, or 0.000158. For 6.2 it would be 

, which gives you 6.31x

, or 0.00000063. As you can see, the concentration of H+ ions is greater in pH 3.8.
To put it simply, the [H+] decreases the higher up the pH scale you go, and increases as you go lower, but now you know the maths to work it out for yourself too.