Angel Gabriel announces the birth of Jesus in a similar way he announced the birth of John the Baptist, with much joy and anticipation. However, Mary's answer was different from Zachariah's. She didn't ask for proof and didn't express doubt. Just wanted to understand how. This is a typical story of God's willingness to cooperate with human beings in fulfilling his plans. By accepting Gabriel's proposal, Mary became an example for those who are willing to partner with heaven for the salvation of many.