Did Adam and Eve Pray?

When we read Genesis, we are left with the impression that Adam, Eve, Cain and Abel simply talked with God. I must google and see the first mention in the Bible of someone actually praying.

Moses seems to talk directly to God. I think I remember Moses giving blessing.
Prophet Elias also seems to talk directly to God on one or more occasions.

Jesus says one should pray in private (in ones closet or room). This would seem to prohibit public congregational prayer.

Jesus says that God the Father already knows what we need before we ask.

When Jesus teaches people to pray, he recite the "Our Father, which art in heaven, etc...etc..." Does that mean that this is exactly and only what one should say in prayer?

Do angels pray? The vision of Ezekiel describes the Seraphim chanting "Holy Holy Holy, Lord God of Hosts". Interestingly, that phrase "Lord of Hosts" first appears in the prayer of Hannah, Prophet Samuel's mother. The expression "Lord of Hosts" never appears in any Old Testament books written prior to Samuel I.

Come to think of it, Balaam seems to speak directly with God, as does Samuel.