Answer:
<em>Perseus</em> sneaks up to <em>Medusa</em>, the only Gorgon who is mortal. He raises his sword, taking aim by looking at the monster through the reflection in his shield, and chops off <em>Medusa's head</em>. As <em>Medusa's head</em> flies from her body, Pegasus, the winged horse, and Chysaor, a giant with a golden sword, jump out of her neck.
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Answer:
It modifies the noun arcade
Explanation: