Why is tissue typing necessary before a kidney transplant?
to determine the compatibility of the blood types of donor and recipient
to determine the compatibility of the organs of donor and recipient
to determine the compatibility of antibodies of donor and recipient
to determine the compatibility of the blood vessels of donor and recipient

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.

With the word calcite wich completes the analogy mineral, erosion, marble, or aragonite

2. which is the last step in the scientific method?