A certain transition metal complex has the formula MX42 . If the metal ion has a d8 electron configuration, what is the shape of the complex

Tetrahedral or square planar

Explanation:

For a d8 metal ion  with a coordination number of four, there are two structural possibilities based on the position of the ligand in the spectrochemical series.

Strong field ligands lead to a square planar complex while weak field ligands lead to a tetrahedral complex. Hence the answer above.

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.