Rocks formed through geological processes can be broken down over time. Water that seeps into cracks in the rock can freeze and expand, splitting open the rock. Which of these geological changes occurs when the ground temperature of an area experiences a daily freeze and thaw cycle? A. The area experiences less frequent landslides.
B. The area experiences a reduced rate of rock erosion.
C. the area experiences a greater amount of weathering
D. The area experiences an increased pace of tectonic plate movement.

"1. it should be, it has been for about 20 years, and it's really not much different in the end than breeding animals to have particular traits. there are always concerns about genetically engineered animals/plants affecting the environment in unexpected negative ways, but i can't think of an example where the fears didn't turn out to be baseless.  

first, as you point out, it would be a great advance in pharmacology, to be able to tailor drugs and their doses to me. the pros involve better medical treatment. the cons involve privacy issues like insurance companies denying coverage to people with genetic risk factors. looking at dna markers wouldn't affect the frequency of genetic diseases, but it would allow detection of them earlier. and ok, actually i suppose that if people used this information to avoid having children with genetic diseases, some might decrease in frequency."