The brain often attempts self-repair by reorganizing existing tissue, but it sometimes also attempts to mend itself by producing new brain cells. the latter process is known as

Neurogenesis is the process that happens in the brain when it attempts to mend itself by producing new brain cells. The word neurogenesis is made up of the words “neuro” which means “relating to nerves” and the word “genesis”, which is in reference to the formation of something.

The answers are out a and b

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.