It's still an open question how life formed from non-life(look up abiogenesis). It's also an open question whether it formed on Earth at all or came here from

It's still an open question how life formed from non-life(look up abiogenesis). It's also an open question whether it formed on Earth at all or came here from elsewhere. So there is no answer to your question as yet. Or at least there's no scientific consensus on one.