with the help of a chart explain the compatiblity of human blood groups .

Explanation

1. In ABO system , the blood groups are determined by the presence or absence of antigen A and antigen B on the surface of red blood cells .
2. The blood groups are of four types , viz . A,B,AB and O.
3. In person with blood group A there is antigen 'A' on the surface of their red blood cells (RBCs) and antibodies 'b' in their plasma .
4. In person with blood group B there is antigen 'B' on the surface of their red blood cell (RBCs) and antibodies 'a' in their plasma .
5. In person with blood group AB there are both antigents 'A' and 'B' on the surface of their RBCs and no antibodies in their plasma .
6. In person with blood group 'O' there are no antigents 'A' and 'B' on the surface of their RBCs but have both 'a' and 'b' antibodies in their plasma .
7. During blood transfusion compatibility of blood has to be taken into consideration . The donor donates the blood and the recipient receives the blood from the donor .
8 . Person with 'O' blood group is called universal donor while the person with 'AB' blood group is called universal recipient . Individuals with blood group O can donate blood to anyone , while those individuals with blood group AB can receive blood from any person .
(iii) (a) Conservation of endangered species of plants and animals is necessary to preserve biodeversity and to maintain the ecological balance , as once extinct then they are gone forever and then no factor can compensate for the consequential ecological crisis.