1. Tracy and Eric are timing how fast marbles roll down an inclined plane. They plan to do this 5 times, and then take the average time for their
results. What would be the BEST way to improve the accuracy of their
data?

A) Include marbles of three different colors in their investigation

B) Include the average of 20 trials down the inclined plane

C) Use marbles of 10 different densities

D) Use toy cars instead of marbles

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.

Yes yes yes very good

Idon’t know i’m just trying to get points to make me look smawt