Which bone is identified in the picture below?

Which of these statements best describes the st. lawrence seaway? the st. lawrence seaway connects the st. lawrence river with the arctic ocean. the st. lawrence seaway provides an important trading route between the u.s. and mexico. the st. lawrence seaway provides an important trading route for the u.s, but has little value for canada. the st. lawrence seaway connects the great lakes, the st. lawrence river, and the atlantic ocean.

You can tell from this karyotype that the individual is female because the karyotype has two chromosomes labeled

How can antibodies "remember" a particular bacterial invader or "antigen" on that invader?