Question

how did the 1898 discovery of blood types affect society? check all that apply.
new ways to preserve and transport blood for blood transfusions were discovered.
blood transfusion safety was improved.
scientists discovered that elements of blood could be separated by centrifuge.
scientists discovered that plasma could be preserved by freezing.
done

Explanation:

1. The discovery of blood types (in 1901, though the question says 1898, likely a slight error) led to understanding compatibility, so new blood preservation/transport methods for transfusions (first option) and improved transfusion safety (second option) are correct. The centrifuge separation of blood elements and plasma freezing preservation are later developments not directly from blood type discovery.
2. So the correct options are the first two.

Answer:

A. New ways to preserve and transport blood for blood transfusions were discovered.
B. Blood transfusion safety was improved.