"…the work of the proletarians has lost all individual character, and, consequently, all charm for the workman. He becomes an appendage of the machine, and it is only the most simple, most monotonous, and most easily acquired knack, that is required of him" (Marx). This quotation alludes to the loss of identity that is incurred by the proletarian class of laborer, which is directly related to the impending sense of alienation and uselessness which Marx also claims devalues the proletariat's familial relations, loss of private property, and general life experience. These conditions are the result of the class war which has been unwillingly declared upon the proletariat by the bourgeois which seeks to exploit the former class. And it is directly due to this conflict, which was initiated by the bourgeoisie, that Marx believes that the proletariat will eventually triumph in the form of an organized revolt that will cease this class struggle. In retrospect, then, the...

Communism is a solution to class war, an answer that Marx believes is inevitable and final, once it takes place on a global stage. Evolution, by contrast, is merely the name of a process in which evolutionary conflict occurs, one which its founder has analyzed as being perpetual. It is not a solution; therefore it exists simply as a part of time, and is as interminable as time itself. Communism, however, is largely dependent on time to provide the means for it as a solution to class struggle, after which such struggle will cease to exist.
References

Darwin, Charles. The Origin of Species. Literature.org. 1859. Web. http://www.literature.org/authors/darwin-charles/the-origin-of-species/

Marx, Karl. The Communist Manifesto. 1848. Web. http://www.anu.edu.au/polsci/marx/classics/manifesto.html