It has been theorized that all of the modern continents on Earth were once part of a single continent. What scientific evidence is used to support this theory?

Explanation:

In 1912 Alfred Wegener German meteorologist proposed the first truly detailed and comprehensive theory of continental drift and was single continent once.

He brought together a chunk of geologic and paleontological data, Alfred W. postulated that throughout most of geologic time there was just Pangea (only one continent).

"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."

i wish i could with all of them i can barley see the first one so here's the answer to the first one b