Which of the following trace fossils is actually fossilized excrement?
a. casts
b. molds
c. borings
d. coprolites

Coprolites are feces of organisms which becomes fossilized excrements that forms some basic components that describe the food that the ogranism ate. Moreover, like other fossils, the appearance of Glossopteridales fossils and coprolites also helped scientists to study so much about species, 

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.

Maybe haha