Amanda built a terrarium five years ago. A terrarium is a sealed glass container with soil and plants inside. Her friend Adam sees it on the windowsill and asks how she cares for the plants inside. She replies, "I watered it once five years ago, sealed it, and have not touched it since." Adam does not believe her. Which of the following statements BEST defends Amanda's claim?
since her plants are sealed they will not get access to pure sunlight without a barrier even if she waters them, and watering the once in 5 years is clearly not enough. so adam should not believe her.