3.) The percentage of cells in each phase or stage can be used as a measure of how long each phase lasts. The cell cycle in onion cells takes 1,440 minutes (24 hours), so if you take the percentage of cells in each
phase and convert it to a decimal figure by dividing by 100 and then multiply the amount of time the cell
cycle takes, you can calculate the approximate time each stage or phase of the cell cycle lasts.
Formula: Duration of phase (in minutes) = percentage/100 X 1,440 minutes

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.

Idont know but good luck; )

The  answer is 1 amu.