Final answer:
Genesis 3:15 is known as the protoevangelium because it is the first prophecy about Christ. This verse foreshadows Jesus coming to defeat Satan and provide salvation for humanity.
Step-by-step explanation:
Genesis 3:15 is known as the protoevangelium because it is the first prophecy about Christ. In this verse, God speaks to the serpent and says, "And I will put enmity between you and the woman, and between your offspring and hers; he will crush your head, and you will strike his heel." This is interpreted as a foreshadowing of Jesus coming to defeat Satan and provide salvation for humanity.