Answer:
Principle of faunal succession
Explanation:
Principle of faunal succession - 
According to this theory ,  the layer of the sedimentary rocks have fossils of the flora and fauna . 
Which helps to study the rocks regarding the ages and the types of specifies found at that time . 
It is the best method to study about the ancient lives , which helps by determining the relative age of the rocks .
Even the law of superposition is used to determine the time and age of the sedimentary rocks . 
 
        
             
        
        
        
Madagascar is off the East coast of southern Africa
        
             
        
        
        
It is wet because it is touching the water. it is a natural habitat, so the fish itself does not feel wet.