Some have argued that the 2nd Law of Thermodynamics says that disorder (also referred to as entropy) increases over time and that, as a result, evolution cannot be correct since it claims that there is increasing complexity over time. For example, a garden, if left unattended, will deteriorate over time rather than keep itself neat and tidy (increasing in order and complexity). Or a building if left to itself will also deteriorate over time rather than remodel itself into something better (increasing in order and complexity).
The argument, however, assumes that things are left to themselves. The critic argues that the 2nd Law of Thermodynamics applies to closed systems in which there is no external source of energy. But scientists have pointed out is that this misfires as an objection because the Earth is not a closed system. There is an immense amount of energy constantly being poured into the system from the sun. The sun’s energy is converted through natural processes into other forms of energy, and this is what nurtures and powers the development of life on Earth. Essentially life on Earth still has a few billion years left before the usable energy from the sun is gone.