Explain how the text structure of each passage supports each author’s purpose for writing. Use evidence to support your response. Passage:

What will astronauts eat when a space voyage takes years or even decades? Lots of fresh vegetables, says Dr. Mary Musgrave of the University of Massachusetts. She has spent the last 10 years learning how to grow plants in space. And it’s a good thing she has already started her work, because extraterrestrial gardening can be tricky. In 1997, while the Mir Space Station spun around Earth, astronaut Mike Foale peered at a sealed growth chamber. The astronaut had planted Dr. Musgrave’s quick-growing seedlings in the chamber, but none of the stems were showing. He opened the container and saw the problem. The white stems weren’t growing upward. Instead, they threaded downward or sideways. Some of the roots snaked up, while others twisted around. These were confused plants. On Earth, a plant’s roots and stems take cues from gravity, using the Earth’s pull to find “up” and “down.” This process is called gravitropism. On the Mir, there was almost no gravity. Dr. Musgrave suggested a solution: give the plants more light. This idea made sense because plants also use sunlight to find their way—a process called phototropism. And it worked. Once the seedlings had more light, the stems turned up and the roots went down. Now Dr. Musgrave was free to worry about the next problem: Would her baby plants live to flower?

Text structure: Compare and contrast i believe