What are the constituent ions in the ionic compound fecr2o7
a: 1fe+ cation and 1 cr2o7-
b: 1fe2+ cation and 1 cr2o7-
c 1fe2+ cation 2 cr6+cations and 7 o2- anions
s
d 1 fecr2 14 cation 7 o2- anions

is it a purebred? it looks more like a red nose, but it doesn't have the red could it be a staffordshire bull terrior? unsure if that's the right name for it sorry

nanotechnology is a powerful tool in biomaterials research as it creates numerous possibilities for the engineering of functional molecules. nano-bio refers to projected ability to incorporate biomimicry into various materials at nanoscale.  

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.