Asoccer ball is rolled across four different surfaces: a tile floor, a paved road, a grassy field, and a cement side walk. which surface will slow the movement of the soccer ball the most? explain why.

The grassy field would slow down the soccer ball the most because it is not a very flat smooth surface. The grass is very thick and kind of grabs the ball.The paved road, tile floor, and cement sidewalk are flat and smooth

The grass would slow the ball down because of friction and the road, sidewalk, and tile floor would make the ball go faster because the surface is smooth.

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.