The clonal selection theory implies that:
a B cell has multiple types of antigen receptors.
brothers and sisters have similar immune responses.
antigens activate specific lymphocytes.
the body selects which antigens it will respond to.

Antigens activate specific lymphocytes

Explanation:

The clonal selection theory (also named the theory of antibody activation) is used in inmunogenetics to understand the functions of the lymphocytes in the immune system. From this theory is it possible to understand the vast diversity of antibodies in the blood during the initiation of the immune response

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explanation:

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step 1: nitrogen fixation- conversion of atmospheric no₂ into forms useful to plants by lightning, bacteria, and cyanobacteria.

step 2: nitrification-process of converting ammonia to nitrite or nitrate.

step 3: assimilation-plant roots absorb new form of nitrogen.

step 4: ammonification-conversion of organic nitrogen to ammonia by bacteria involved in decomposition.

step 5: denitrification-bacteria turns the decomposed matter back into n₂o, which is released into atmosphere; repeat cycle.