The LD-50 of the insecticide parathion administered orally to rats is 20mg/kg. How much parathion woulGhave to be fed to a rate that weighs .75kg to give a 50% chance of killing it.

Which feature do highland climates have that lower elevation areas do not?

The name of the ion, s2-, is: sulfurous ion sulfide ion sulfur ion sulfate ion

Asample of hydrated tin (ii) chloride (sncl2) has a mass of 4.90 g. when it is dehydrated, it has a mass of 4.10 g. which is the correct chemical formula for the hydrate? sncl2•2h2o          sncl2•4h2o          sncl2•6h2o