Hydrogen gas is allowed to permeate through a thin plastic membrane that is 110 microns thick. Concentrations of 0.025 moles/m3 and 0.0025 moles/m3 are maintained on the high and low pressure sides of the membrane, respectively. If the diffusivity of hydrogen gas molecules in the plastic is 3.7x10-8 m2/s, what is the steady-state diffusion flux of hydrogen gas passing through the plastic membrane

for points guys

the answer is b because, investigating whether another species of moth also drinks tears might be interesting, but it would not directly explain why this species of moth does.

to explain why this species of moth drinks tears, the scientist could ask: "what nutrients that moths need are in elephant tears? "

the scientist could experiment with moth repellent or oter ways to keep the moths away, but that would not answer his original question.