Explain how there can be so many different kinds of suntances in the world

Because people make those substance out of other things

There is different kind of suntances because people use or make it

So what you would do is go through and add 3 teaspoons(tsp) 6 times because of the 6 tablespoons(tbsp). which will give you an answer of 18. another way is to multiply 3x6=18.