Dna absobstion

According to the 1996 book Godzilla vs. Destoroyah Super Complete Works, Destoroyah can absorb the DNA of creatures he attacks by dissolving their cells with micro-oxygen. Destoroyah used this ability to absorb Godzilla Junior's DNA when he bit into him, allowing him to further mutate into a bipedal form with an endoskeleton rather than an exoskeleton.