Two students want to observe pill bugs for a day to learn more about them. They use a small glass fish tank to create a pill bug habitat. The students add dirt, leaves, twigs, and pieces of cut-up raisins to the habitat. They use a spray bottle to lightly mist the dirt and leaves with water. Then they place a lid with small holes on top of the habitat. Identify two needs of pill bugs and describe how the students have designed the habitat to meet those needs