Review the images of the two biomes, the tundra and the taiga. notice that while there are about 1,700 kinds of plants there are virtually no tree species in the tundra. what are the limiting factors in preventing the immigration of tree species into the tundra. all but one can apply

a. rocky, poor soil
b. very short growing season
c. the presence of permafrost
d. winters are 6 months long

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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.