Answer:
endosymbiosis.
Explanation:
By the beginning of the 20th century, researchers thought that plastids and mitochondria could come from bacteria. These would have been ingested by primitive cells and live within them in symbiosis.
 
        
             
        
        
        
When you cut your hand your body reacts to it as a stimulus 
So stimulus
        
             
        
        
        
Answer:
Both climate change and humans were responsible for the extinction of some large mammals, according to research that is the first of its kind to use genetic, archeological, and climatic data together to infer the population history of large Ice Age mammals.
Explanation:
 
        
             
        
        
        
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➷ The correct option is A. 2, 4, 1, 3, 5
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