Crusader's physiology as a Skrull facilitates his ability to blend into human society through several key aspects:
Shape-shifting Abilities: Skrulls, including Crusader, have the innate ability to reshape their physical appearance at will. This means they can perfectly mimic any human appearance, down to the smallest detail. This ability allows them to seamlessly integrate into human society without being detected (source).
Replicating Memories: Some iterations of Skrulls can also replicate recent memories of the beings they impersonate. This greatly enhances their ability to blend in without raising suspicion, as they can imitate not only the appearance but also the behavior and knowledge of the individuals they impersonate (source).
Molecular Instability: Skrulls possess unstable molecules in their bodies that can be manipulated at will. This pliability allows them to not only change their shape but also adapt to different physical conditions and environments, further aiding in their seamless integration into human society (source).
Deception and Infiltration: Skrulls are known for their devious and untrustworthy nature, which they use to their advantage in espionage and infiltration missions. This cunning nature, combined with their physical abilities, makes them effective infiltrators (source).
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