Which of the following statements is true of the chemical abnormalities in the bodies of people who suffer from bipolar disorder? a deficiency in the neurotransmitters dopamine and neuropeptide y (npy) leads to bipolar disorder in people who have experienced stressful situa­tions. high serotonin may be coupled with low levels of norepinephrine in the manic phase and with high levels in the depressed phase. in both the manic and depressed phases, serotonin levels are very high. thy­roid hormones are sometimes present in either abnor­mally high or low levels in people with bipolar disorder.

Embryonic stem cells are cells derived from an embryo. these cells can be used to create new tissues for patients suffering from certain illnesses and disorders. which statement best summarizes why the use of embryonic stem cells could be seen as unethical? a. some people consider embryos to possess rights equal to those of fully developed human beings. b. extracting stem cells from embryos is a very energy-intensive process, which consumes resources that could be used elsewhere. c. embryos are difficult to obtain, so the monetary cost of using them for research outweighs their benefit. d. the process of extracting stem cells from embryos generates biohazardous waste that cannot be safely disposed of.