Why ? Because both companies have their fair share of alternate universes, there is a possibility that both universes exist in each others alt. universes. And there have been crossovers such as superman vs spiderman and batman vs the hulk. And marvel has a specific earth for this, they call it the "crossoververse": http://marvel.wikia.com/Earth-7642 . It's actually more likely that dc exists in marvel than marvel exists in dc. Because marvel has millions of alternate earths while dc only has 52.
Marvel
Formerly known by names including "Atlas" and "Timely", Marvel Entertainment is the publisher of comic books featuring iconic characters and teams such as the Fantastic Four, Spider-Man, the Avengers, the X-Men, Iron Man, the Hulk, Thor, Captain America and Daredevil. Currently owned by the Walt Disney Company, Marvel is one of the "Big Two" comic publishers along with DC Comics.
Do marvel and dc coexist
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