Pls help if u know the ANSWER During a field trip, Luis notices that an old marble statue looks different from a new marble statue. The surface of an old statue is rough. The new statue is smooth and shiny. After doing research, Luis learns that marble undergoes chemical reactions with acid rain. The reactions cause some of the marble to be worn away. What did Luis observe on his field trip?

Erosion
Deposition
Physical weathering
Chemical weathering

"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."

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explanation:

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