Q: Two friends studied different planets for their school project. Sean studied Earth's atmosphere, while Bill studied Venus's and Mercury's. Which friend studied more about clouds made of carbon dioxide?
A: Bill

Q: Two groups of people participated in a geriatrics study. group D had people over 65 years old, while group Y had people in their 40's in its composition. Which group had people at greater risk of developing cancer?
A: group D

Q: Two sister cities had different environments. Shanghai had big problems with air pollution while Berna took very good care of the surrounding environment and air quality. Which city had people at decreased risk of developing asthma?
A: Berna

Q: Gary is a high school student examining two cells under a microscope for his biology class. In a petri dish, marked Cell X, Gary sees that substances inside the cell are spreading apart from each other making it less concentrated. In the dish marked Cell Y, Gary sees substances coming together and moving into close proximity to one another. Which cell is utilizing diffusion?
A:
Cell X