Monod's best-known work explains how llife is the product of a combination of chance and necessity.[2] It has been described as a "manifesto of materialist biology in the most reductivist sense",[3] because Monod says that systems in nature can be explained without introducing any end-goal or purpose. He then argues that certain beliefs and ethics followed from his outlook on biology: atheism, rationalism, anti-Marxism.[4]