1. What substance makes plants green?
2. What gas do humans inhale to survive?
3. What organ pumps blood?
4. Red Planet?
5. Largest organ?
6. Photosynthesis occurs in?
7. Chemical formula of water?
8. Gas in soda?
9. Who invented the telephone?
10. CPU stands for?
11. A female horse is called?
12. Tree is fixed to soil with?
13. Young cow is called?
14. What do bees collect from flowers to make honey?
15. How many legs does a spider have?