13) Correct
14) Producers (plants) are autotrophs (make their own food) other animals rely on the plant, weather its to feed their own prey, or they want to eat the plant itself. They are heterotrophs.
15) 10% is lost through every level.
So plants have 5000 calories.
Primary consumers will only gain 500 calories.
Secondary consumers will gain 50 calories.
Tertiary consumers will gain only 5 calories.