Everywhere we see every living creature is produced from another living creature. Nature works in a symmetrical manner. We know the changing of the seasons will go on every year in the same way, we know the sun will rise in the morning. Nature does not suddenly change her way of doing things. We don't have a single case ever recorded in history of any sort of life coming from a combination of chemicals.
Life always comes from life.
That is natures way and that has always been natures way. As I have my mother and father and have come from them, the whole universe has come from the Supreme Father, Krishna, God and the supreme mother, nature. The Supreme Father places the living entities within the womb of the supreme mother, nature, and in time they take birth in the 8,400,000 different species and forms of life found throughout the universe. This is quite a reasonable proposition and it is consistent with our observation of how the universe works. The scientist's proposal, on the other hand, that life comes from chemicals, is something we can't observe happening anywhere within nature.