[metmom] "What's that supposed to mean?"
It means that these mathematics, physics, chemistry and biology are matching parts of a bigger picture. Understanding this picture allows us to develop technology and rationally invent therapeutic agents. Understanding this picture, however, has an undesirable (to some) side effect - it leads to conclusions incompatible with beliefs such as Young Earth Creationism.
"It was [the dominion] already mans by God's decree."
Sure, and no earlier than 100 years ago people used to die of trivial pneumonia, childbirth infections or infected wounds. In addition to God's decree, we need practical MEANS to gain the dominion, and these means were developed together with modern science. Again, evolutionary biology came as matching and necessary part of the package.