The immune system has specialized cells and tissues that protect the body against disease and harmful substances by forming , which are specialized proteins that render invading agents harmless.

The correct answer is- antibodies

Explanation:

The immune system has many immune cells which are called white blood cells. Each cell has its specific and important role in preventing infection by fighting pathogens.

The immune system has a specialized cell called B- cells that produce antibodies which are specialized proteins that help in destroying the invading agents.

Antibodies are glycoproteins produce by plasma cell which is differentiated from B cells. There are five types of antibodies IgA, IgE, IgD, IgG, and IgM. Each antibody is specialized and fights with different types of antigens.

answer; polycythemia is the correct answer;