The first and second laws of thermodynamics:

1. Matter and energy can be converted from one form to another but cannot be created or destroyed. The amount of matter + energy in the universe is constant.

2. Whenever the state of a system changes, the potential energy of the end state will always be less than the energy of the initial state. All changes of state result in a decrease in potential energy, which can also be stated as an increase in entropy.

There is nothing inherently different about the biochemical processes that generate energy for living things compared to nonbiological chemistry, and evolution at its most fundamental level is nothing more than a series of changes to the structure of an organic molecule (DNA or RNA). Evolution does not violate the first law of thermodynamics.

The second law applies to the universe as a whole, or to any other *closed* system. If there is an external source adding energy to the system, there is no reason why the end state cannot have greater potential energy (lower entropy) than the initial state. In the case of evolution, the earth is not a closed system, since it receives additional energy from the sun. Evolution does not violate the second law of thermodynamics.

In science, a theory is a concept which is supported by multiple lines of evidence. The popular notion of a theory as more of an educated guess than a description of the real world is referred to in science as a hypothesis. The evidence in support of evolution includes the fossil record (as interpreted based on our knowledge of geology and with the help of radionuclide dating, which itself is possible because of our understanding of nuclear physics), comparative anatomy, and the similarities and differences in genetic material between different types of organism, among others.
Source(s):
http://www.talkorigins.org/faqs/faq-speciation.html

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