Which of the following was demonstrated by the miller-urey experiment?
a. life arose spontaneously from inorganic molecules on early earth.
b. in the presence of an energy source, organic molecules can by synthesized from inorganic precursors
c. it is impossible for life to arise from inorganic molecules.
d. organic molecules can be formed from inorganic precursors, but only in the presence of molecular oxygen.
e. it is impossible to replicate conditions on early earth in a laboratory.

An 80-year-old woman comes to the urgent care clinic with dyspnoea on exertion. on physical examination, her blood pressure is 100/70, and her pulse is 75. she has no pulsus paradoxus. her jugular veins are distended, and she has distant heart sounds. in addition, she has extra third and fourth heart sounds. her liver is enlarged, and she has pedal oedema. she has occasional premature ventricular contractions on her electrocardiogram. a chest x-ray reveals clear lung fields with a dilated cardiac silhouette. her echocardiogram reveals ventricular walls with a "speckled pattern". which of the following is the most likely diagnosis? - alcoholic cardiomyopathy- amyloidosis- haemochromatosis- tuberculosis- viral myocarditis