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 . 
 
        
             
        
        
        
The correct answer is - the change of the total volume of water in the Earth's system.
The total volume of the water in the Earth's system is pretty much the same, and for it to change, and change the levels of the water in the oceans and seas, the Earth will have to go over a totally new conditions where either a new influx of water will reach our planet, or the heat will increase and the water will evaporate, for now that is not a possibility. 
        
             
        
        
        
Answer:
True
I hope this helps you <333
 
        
             
        
        
        
Continent-continent collisions:)
        
             
        
        
        
B.A high TFR usually indicates high population growth
high fertility rate means a greater chance of baby leads to higher growth rate