Paul and Michael sell magazine subscriptions by telephone. P…

Paul and Michael sell magazine subscriptions by telephone. Paul is paid $1.00 for every five calls he makes, while Michael is paid $1.00 for every subscription he sells, regardless of the number of calls he makes. Paul’s telephoning is reinforced on a ________ schedule, whereas Michael’s is reinforced on a ________ schedule. 

The product Milkaid contains lactase enzyme that, when added…

The product Milkaid contains lactase enzyme that, when added to milk, break down lactose so that individuals with lactose intolerance can still drink it.  Jonathan follows all instructions for storing and using Milkaid, except that he adds it to milk and drinks it immediately. Later he becomes ill. Why didn’t the enzyme work?