The formula used can be found in Quora.com (population*average height)/Earth's circumference), gives the result of the number of the human chain. 
If the average height of an American is 1.77m and the US population is  326, 292, 068 (June 2, 2017) and if everyone is already an adult. 
US population 326, 292, 068
Average height according to study 
is estimated as the same as arm span  <span>1.77
</span>Earth circumference in meters: <span>40,075,000
</span>
<span>
(</span>326, 292, 068 people * 1.77m) / 40,075,000m = 14.411 times
        
             
        
        
        
Igneous - A rock formed by the cooling and crystallization of magma (molten rock) at or below the Earth's surface. Sedimentary - A rock formed as a result of the weathering process, either by compaction and cementation of rock mineral fragments, or the precipitation of dissolved minerals.
        
                    
             
        
        
        
Answer:
 correct option is A.
Succession is the process by which the structure of a particular community evolves over a specific period of time. There are two types of succession, primary and secondary succession. Primary succession is a type of succession that occurs in a place which is incapable of sustaining the growth of plants, that is, it usually occur on barren lands. All the options given above are examples of places for primary succession with the exception of option A.
 
        
             
        
        
        
Answer:
When heated too much, enzymes (since they are proteins dependent on their shape) become denatured. When the temperature drops, the enzyme regains its shape. ... Changes in pH will also denature the enzyme by changing the shape of the enzyme. Enzymes are also adapted to operate at a specific pH or pH range.