The final exhibit was Sarah's favorite. It was a special greenhouse where scientists were growing plants just like they do on the International Space Station.
"Plants are very important in space," Alex explained. "They provide fresh food for astronauts, help clean the air, and might help us grow food when we build bases on Mars!"
Sarah noticed that some plants were growing sideways and others upside down. "Why are they growing like that?" she asked.
Alex smiled. "In space, there's no up or down because there's no gravity. Plants can grow in any direction, but they always grow toward the light!"
1. What was the final exhibit Sarah's class visited?
2. Why are plants important in space?
3. What was unusual about how the plants were growing?
4. Why do plants in space grow toward light?