The sinister serpent was unique among wildlife for cruel, selfish deceit. It slithered over to Eve and hissed that the Tree of the Knowledge of Good and Evil looked beautiful, and the fruit looked just as delicious. Undoubtedly, there was a subliminal comparison to Eve as beautiful and divinely approved. So why should the tree and the fruit be any different in God's creation? It was a big mistake on Eve's part to listen to the sinister serpent, and to talk Adam into doing so too. She should have shown respect to God by having a divine audience first before rushing headlong into disaster.
No, the snake tricked Eve into eating the fruit, then Eve persuaded Adam to eat it.
Adam and eve
The snake or serpent is a representation of the devil, or Satan, in flesh. He came to try to tempt Adam and Eve into turning from God.
She didn't "trust" Satan (the snake). She was tempted. Satan kept telling Eve that the fruit would give Eve the intelligence of God. So she gave in.
Satan
Yes, a pet snake.
The snake in the garden that god specifically told Adam and Eve to stay out of. The snake resembles satin.
Maybe, if Lucifer didn't disobey God he woud'nt be Satan and the snake to tempt Adam and Eve.
Satan or the bad minds of greed
It usually depends on the story it appears in. Generally, a snake represents betrayal and trickery, originating from the story of Adam and Eve.
God created this covenant between him and Adam and eve to show us that Jesus would come to save us from our sins and also to see if Adam and Eve would trust him.
I am guessing that you mean that when does it first appear, it is as a serpent. In the story of Adam and Eve, the serpent is the one that tries to deceive Adam and Eve into eating the forbidden fruit. He eventually convinces Eve to eat the fruit and Eve convinces Adam to eat the fruit as well. They then were made to leave the garden because of their disobedience to God.