Why is it very difficult to develop a new drug for antibiotics?(how long does it take, how much does it cost) And, why do we need to explore resources in places like the Arctic instead of someplace closer to the US? At least 5 sentences.

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Check all that occur during ventricular systole. a. the av valves open to allow blood to enter the ventricles from the atria. b. the av valves open to allow blood to enter the ventricles from the atria. c. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. d. the semilunar valves remain closed throughout systole to prevent backflow of blood into the ventricles. e. the semilunar valves open to allow blood to flow into the large arteries. f. the semilunar valves open to allow blood to flow into the large arteries. g. the av valves close to prevent backflow of blood into the atria.

Apatient receives 250 ml mg of oil drug at noon 6 p.m. and midnight the drug has a half life of 6 hours how much does a drug remain in the patient at 6 a.m. the next day