Penelope studies how the structure and function of the nervous system is related to behavior. she is a

The answer is a neuroscientist. Neuroscience deals with the physiology of the nervous system, anatomy, biochemistry of neurons. They are able to relate this to behaviors to a person and his or her capacity to learn.  Neuroscientists are relevant to the field of cognitive neuroscience and behavioral neuroscience

Ты не знаешь ни английского языка

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.