During reflection, waves are sent a. into atmosphere b. in several directions at once c. in a direction parallel to the tide d. in the direction from which they came

Reflection- "The term reflection means that when an incident wave interacts with a different medium and changes its angle or direction of travel is known as reflection."

Explanation:

So by taking the first rule of reflection into our consideration we can say that the incident wave coming in interaction with a different medium will reflect with the same angle like that of the incident wave. And will follow the region from where it originates.

Correct option- option "D" is the correct one.

"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."