Question

which was not a result of the 1898 discovery of the four blood types and advances made during the two world wars?
○ improved blood transfusion safety
○ effective blood preservation solutions developed
○ ability to separate different parts of blood for different uses
○ all blood types were made universally compatible

Explanation:

The discovery of blood types and advancements during the World Wars led to improved transfusion safety (matching blood types), blood preservation solutions, and separating blood components. However, blood types have inherent compatibility rules (e.g., O is universal donor, AB universal recipient), and it's impossible to make all blood types universally compatible.

Answer:

D. all blood types were made universally compatible