What is a solution in science?

In figure 4 of the telephone components what do the labels lettered a to e

What is the primary theme of ha jin’s “a decade”?

Which sentence is punctuated correctly? the shoes normally cost 40 dollars, however; we got them on sale. the shoes normally cost 40 dollars however we got them on sale. the shoes normally cost 40 dollars, however, we got them on sale. the shoes normally cost 40 dollars; however, we got them on sale.