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Hydrogen
Oxygen
Ozone
Helium
Ultraviolet rays can be used in water treatment as
Under the electron microscope, you observe a cell with three different types of large organelles, each bounded by two membranes. The cell is most likely
Unit of current
Uranium eventually decays into a stable isotope of -
Urea is a
Vaccination was started by.......
Velocity of wind is measured by
Vermicompost is a/an
Very small time intervals are accurately measured by
Vinegar is _.