Sally's teacher asked her to classify the organisms in a sample of pond water. one key feature can be seen that sally rule out the kingdom eubacteria. that was the presence of a) cilia. b) cell wall. c) organelles. d) chlorophyll.

Eubacteria are prokaryotic, which means that they do not have defined membrane limited nuclei. This means that Eubacteria do not have a nucleus or cell organelles. Thus the answer is C.

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.

From our previous experiment, we examined how many drops a penny can hold - and place drops of salt water on the penny after recording 5 trials each, take the average of each solution.