Jill runs a hot bath. she starts to get into the tub but the water feels extremely hot. she stands in the hot water for a few moments, then slowly sits down, easing the rest of her body into the water. after a few minutes, she feels quite comfortable; the water no longer feels too hot to her. jill has experienced:

Based on the given scenario, Jill is experiencing sensory adaptation. A sensory adaptation is where sensory system that a person acquires has ability to change in a way that they could adapt in certain situations. It is seen above as the hot water made her feel uncomfortable as she does not intend to sit on the tub while it is still hot and later on, she manage to be comfortable with the hot water after her sensory system has adopted to the stimulus which is the hot water in the tub. The sensory adaptation makes a person’s sensory system feel a change in response of a factor that will affect the system into leading it cope up with the factor affecting it.

"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."