Acell with normal tonicity is placed in a 200 mm nacl solution. this solution is and the cell will

The concentration of a cell is generally 0.15 M  (0.9 % NaCl)

As given the solution has concentration = 200mm = 0.02 M

This concentration of solution is less than the concentration of cell

Hence solution is hypotonic (less concentration) and cell will be hypertonic

organisms are more likely to be more preserved in mud than sand because mud is moist and wet, while sand is very dry.