Certain corals have been found in extremely deep water. these coral lack the zooxanthellae that are found in tropical coral reefs because zooxanthellae require sunlight to go through photosynthesis and there is no sunlight available at these depths. these deepwater coral often are built upwards instead of across the bottom. why do the polyps build the coral this way?
a.)the pressure of the deep water is too great to build outwards.
b.)they grow to avoid predators.
c.)they are filter feeders.
d.)the temperature of the water keeps them from building outwards.

videntify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.identify the dna change shown in the diagram and explain how that change can result in the increased genetic diversity often seen among siblings.

"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."