Which of the following statement correctly identifies how a genetic mutation can affect an organism? Question 3 options:
1 Mutations have no affect on organisms and their structure or way of life.
2 Mutations are always harmful and lead to the early death of an organism.
3 Mutations can give organisms new abilities not seen before.
4 Mutations can alter or stop the production proteins in a way that either alters the appearance or quality of life of an organism.

Hold on to his or her beliefs even if there is no evidence for those beliefs.

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.