Answer:
4. Amount of food that a dog eats depends on its size.
Null: If the dog eats food, then it will not get big.
Independent: Amount of food
Alternative: If the dog eats food, then it will get big.
Dependent: size
5. An electric motor turn faster if you increase the current.
Null: If you increase the current of the electric motor, then it will not turn faster.
Independent: Current
Alternative: If you increase the current of the electric motor, then it will turn faster.
Dependent: Speed
6. A child will grow heathtier if he eats vegetables.
Null: If a child eats vegetables, then he will not grow healthier.
Independent: amount of vegetables?
Dependent: Growth
Alternative: If a child eats vegetable, then he will grow healthier.
