I don’t think there’s a hard line. Nematodes will react to being touched, that implies a primitive level of self-awareness. Most animals possess some form of proprioceptive sense, against, a form of self awareness. Higher self-awareness is just about being able to predict and plan your own actions a few more moves ahead.

Consciousness maybe, but intelligence is a given. Amoebas can transfer memory and intelligence no problem simply by meeting and combining