<span> There are two main methods of determining the salt content of water: Total Dissolved Salts (or Solids) and Electrical Conductivity. Total Dissolved Salts (TDS) is </span>measured<span> by evaporating a known volume of water to dryness, then weighing the solid residue remaining.</span>
Delta waves that are characterized by deep sleep low frequency waves
C is your answer so pick c
It would be the butterfly orchid since it is a primary producer known as an autotroph! (Is this is AP bio exam?)
