Which was not a result of the 1898 discovery of the four blood types?
a. improved blood transfusion safety
b. effective blood preservation solutions developed
c. elements of blood separated via centrifuge
d. all blood types made compatible with each other

The right answer is D. All blood types made compatible with each other

Blood is a liquid tissue that can be easily removed from a healthy individual for transfusion to a sick individual. However, despite an identical cellular composition of this tissue, there is variability, or polymorphism of the various elements of blood between individuals, which makes transfusion impossible between certain groups of people.

People with the same characteristic are said to belong to the same blood group. In general, these characteristics are evidenced by haemagglutination techniques using antibodies or lectins specifically recognizing an epitope. In case of problems, molecular biology can be used. These epitopes, determining various phenotypes, are genetically transmitted.

The discovery of the ABO system, the first of these systems in 1900 by Karl Landsteiner, made it possible to understand why some blood transfusions were successful, while others ended tragically.

they are known to reach a speed of 21 miles per hour

•there must be variation for the particular trait within a population.

•the variation must be inheritable (that is, it must be capable of being passed on from the parents to their offspring).

•individuals with one version of the trait must produce more offspring than those with a different version of the trait.good

explanation: