angle of incoming sunlight
Explanation:
The single feature that primarily determines the variation in climate in different parts of the world is the angle of incoming sunlight. 
- Climate is simply an extended study of weather over a long period of time. 
- The elements of weather like temperature, pressure, rainfall all conditions climate. 
- The angle of incoming sunlight is by far the most important factor that determines climatic patterns on the earth. 
- Around the equator, the sun is overhead and these regions are usually hot driving a wide range of weather phenomenon. 
- The polar and temperate regions receive diffused sunlight because the sun is at an angle there. 
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Also the alimentary canal or digestive tract
        
             
        
        
        
Deforestation. The animals forest that they once lived in are bein cut down.
        
             
        
        
        
it's b. anaphase and spindle fibres pulls chromosomes towards the centrioles in this phase.
 
        
                    
             
        
        
        
Correct answer: False
A primary source provide the first hand proof and the original information of the event, object, person or work. 
Example: Research data, e.g. public opinion polls, speech
Secondary source is that source of information that is not performed or collected by the individual but it is taken from old information. It is updated by someone who is not participation in the event or the research.
Example:  Library, ebook, reviews.