Latoya's variables were :
Independent Variable: spot to plant the plants, under tree or in sunlight
Dependent Variable: the type of plants used
Latoya's controls were: In this experiment, Latoya didn't really have a control. A control is something to look at, something that will stay the same to look back to. A guideline.
Latoya could have improved her experiment if she gave each plant equal treatment. She would have to plant corn in the sunlight AND under the tree. She would also have to plant the beans under the tree and in the sunlight.