You would want this observation to be in an area with a lot of biotic and abiotic factors, so the best place for it is an ecosystem. 
        
             
        
        
        
It is known as cloning! Hope this helped!
        
             
        
        
        
It is supported by evidence from a wide variety of scientific disciplines, including genetics, which shows that different species have similarities in their DNA. There is also evidence supporting the Theory of Evolution in paleontology and geology.
        
             
        
        
        
Answer: Option B.
Biogeographical
Explanation:
Biogeographical evidence is the evidence that provide information of organisms distribution over geographical areas. It provide information on how and when the organisms evolved and common descent.
Frombthe question, biogeographical evidence will help Darwin make his observation
 
        
                    
             
        
        
        
Answer:
Structure of the atmosphere
The atmosphere can be divided into five layers according to the diversity of temperature and density. They are:
Troposphere
Stratosphere
Mesosphere
Thermosphere (Ionosphere)
Exosphere
Explanation:
Composition of the atmosphere
The atmosphere is made up of different gases, water vapour and dust particles.
The composition of the atmosphere is not static and it changes according to the time and place.