Final answer:
Life appears according to 19th century ideology when conditions are right, which aligns with the Copernican principle. The era of the Industrial Revolution paved the way for a greater understanding of biological processes like evolution by natural selection, although the exact origins of life remained a mystery.
Step-by-step explanation:
According to 19th century ideology, life appears when certain conditions are appropriate, a concept derived from the broader Copernican principle. During this era, beliefs about the origins of life were shifting, due in part to the significant transformations brought on by technological and scientific advancements, as seen in the Industrial Revolution. These advancements led to a greater interest in and understanding of biology, including the process of evolution by natural selection, which explained the diversity of life-forms on Earth but not the mystery of life's beginnings. The hypothesis that life will arise whenever the conditions are right remains a subject of scientific inquiry and observation, with scientists today still seeking a second example of life within our solar system or nearby stars to support this view.