Sarah performs an experiment to see whether bees prefer red flowers or yellow flowers. look at this table of results from the what is the independent variable? . 

it's c.color of flower

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.