The answer is: it is about evolution. 
Darwin himself characterized his seminal book, <em>On the origin of the species, </em>as “one long argument”. There is still debate as to what exactly did he mean by that characterization, but it is agreed upon that he evidently was referencing his theory of evolution based on common ancestry between species and natural selection as the process of differentiation between them, which, all in all, tells a story that took millions of years, or, in more poetic terms, it summarizes a very long argument. 
 
        
                    
             
        
        
        
Answer:
According to structure, this sentence is a COMPLEX SENTENCE.
According to function, this sentence is a DECLARATIVE SENTENCE.
 Explanation:
This is a COMPLEX SENTENCE.
- A complex sentence has one or more dependent clauses.
 
This is because the thought is complete. It has a subject and a predicate (the action or information about the subject). "The students are studying."
- Due to the subordinating conjunctions, a dependent clause has both a subject and a predicate (before, although, since, when). "Because he is unprepared."
 
With the most votes, he garnered only 40% of the popular vote. It has one dependent clause and one independent clause.
- Although he garnered the most votes,
 
He received around 40% of the vote.
This is a DECLARATIVE SENTENCE.
Statements are declarative. It's punctuated.
When a period finishes a declarative sentence, these criteria are met.
 
        
             
        
        
        
Who is the answer of the question