(a) Suppose that the average person in the population falls asleep in 15 minutes (without
listening to classical music) with o = 6
minutes. State the null and alternative
hypotheses for this study.

Ohm's law tells you that i = v/r where v is equivalent voltage and r is equivalent resistance of the circuit
since all circuits have the same voltage, your question is really asking which circuit has the lowest total resistance, since the lower the resistance, the higher the current
circuit a has a resistance of 5 ohms; circuit c is in series so has a resistance of 10 ohms; circuit b is in parallel and therefore has a resistance of 2.5 ohms (review your notes on adding resistances in parallel and series); therefore b has the highest current

Phagocytes contain digestive enzymes to facilitate the process of phagocytosis

B. that is the answer