"Where does plant mass come from?!" How changing the air can make plants grow taller!
Unfortunately, her new puppy Sparky mistook her project for a chew toy and destroyed it
the day before the fair! Luckily, most of her data remained intact, but she needs help
reconstructing her project.
Which of the following options would be the best option for Constance's dependent
variable?
O The change in the mass of the water in the dirt
The change in the mass of the dirt
O The change in the mass of the plant
O The change in the mass of the air