A cell has many structures inside it. All of these structures are held in the cell by its covering. What is this covering called?

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.

B. a graduated substance

Ireally don’t know this

Pretty sure it's d. heterogeneous is separated by physical properties.