A class is using marshmallows to demonstrate different chemicals' properties by heating and cooling the marshmallows. Which
student is practicing bad laboratory safety?
O Neka is cleaning up the melted marshmallows after recording her observations.
O Nikkos checks his glassware for imperfections before using them.
O Kenneth is using the Bunsen burner to roast the marshmallows and eat them.
O Kojo threw the used marshmallows into the trash can after his instructor told him to do so.

Kenneth is using the Bunsen burner to roast the marshmallows and eat them.

Explanation: you should not be eating in a lb environment without direct permission from your teacher or supervisor.

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.