![]() ![]() This means that an increase in order can occur on Earth as long as there is an energy input-most notably the light of the sun. With biological evolution however, the system being considered is not the universe, but the Earth. Because the universe is an isolated system, the total disorder of the universe is always increasing. An isolated system is defined as one without any outside energy input. However, this objection is grounded in a misunderstanding of the second law, which states any isolated system will increase its total entropy over time. But because evolution results in an increase in the order and complexity of species-which is a decrease in entropy-some critics claim evolution violates the Second Law of Thermodynamics. Buildings don’t strengthen themselves, and no amount of waiting will cause rotten food to become edible again. In both cases, the amount of disorder increases with time, but the opposite is never true. Buildings break down over time, and food spoils if not eaten soon enough. This law has plenty of everyday examples. A common argument against evolution is that the theory contradicts the Second Law of Thermodynamics that claims disorder, or entropy, always increases or stays the same over time.
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