Question

Many experiments have been conducted attempting to replicate the conditions on early Earth. All of them have resulted in the formation of a variety of organic molecules from the inorganic ones, but none have ever resulted in the formation of a cell. In which of the following ways do the conditions of these experiments all differ from the conditions of early Earth that might explain why cells have never formed in the lab?

The intensity of ultraviolet light on early Earth is difficult to reproduce accurately.The composition of the gases available likely changed over time on early Earth.