Answer:The blood group of a person who does not have antigen A or B but is positive for antigen D is classified as blood group O positive (O+).
Explanation: In the ABO blood typing system, there are four main blood types: A, B, AB, and O. These blood types are determined by the presence or absence of specific antigens on the surface of red blood cells. Antigens A and B are responsible for blood types A and B, respectively.
If a person lacks both antigen A and antigen B, they are considered to have blood type O. The positive (+) or negative (-) designation refers to the presence or absence of the Rh antigen, also known as the D antigen. A person who tests positive for the D antigen is Rh-positive.
Therefore, a person who does not have antigen A or B but is positive for the D antigen is classified as blood group O positive (O+).
the process of liquid changing to a gas at the surface of the liguid is called?
Answer:
"evaporation."
Explanation: