Answer my question please
Antigens<span> are foreign particles, usually proteins, which are capable of generating an immune response in the body, a property known as immunogenicity. This immune response consists of specific </span>antibodies<span> which are generated by plasma cells as a result of exposure to a specific epitope presented by the </span>antigen<span>.</span>
<span>I.e. you compare observations with low value of independent variable to those with high one.</span>
2) cell-tissue-organ-organ system
The Answer is B
Explanation: because when you draw the punnet square there are 4 possible outcomes