Ageologist is studying layers of rock. he finds a fossil with an imprint of one of the earliest shelled animals. according to the law of faunal and floral succession, what kind of new animal fossil would he most likely find next in the layers of rock above it?

a fossil of an amphibian
a fossil of a reptile
a fossil of a fish
a fossil of a human

I believe it would be a fossil of a reptile but I'm not a 100% sure about it. 

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.