These white blood cells fight furiously and trap bacteria, but die off after 5 days

I’d have to say no because without oxygen in the water the fish would all be dead. so if you want to fish for dead fish, pick the ponds with the lowest oxygen concentrations.

True, the standard unit for volume is liters which can be represented by either a lower case "l" or a capital "l"

Rate law for this reaction israte of the reaction = k[a]²[b].second order in a  means concentration of a in power of two, and  first order in b means concentration of b in power of one.