### Instruction: Tell me whether these are different types of galaxies or different types of ecosystems: Forest, Grassland, Irregular, Spiral, Aquatic, Desert, Elliptical, Tundra, Marine
### Response: The different types of galaxies include: Irregular, spiral, and elliptical. The different types of ecosystems include: Forest, Grassland, Aquatic, Desert, Tundra, and Marine.