Which body structure do earthworms use for gas exchange?

setae
gills
skin
lungs

If 200.0g of copper(ll) sulfate react with an excess of zinc metal, what is the theoretical yield of copper

Which formula can be used to calculate the molar mass of ammonia (nh3)? molar mass of n + molar mass of h 3 × molar mass of n + molar mass of h molar mass of n + 3 × molar mass of h 3 × molar mass of n + 3 × molar mass of h

Why is carbon ideal for making different compounds?