1. A is the control because it shows the normal environment in which an indoor plant would grow.
2. the variable is the amount of sun that shines on the plant. A has the window open with the sun shining through and b has the shades closed.
3. If a plant is denied sun, then it won't grow as well as a plant with partial sun.
5. A grew more and quicker then b
6. this is shown on the graph above