Last few. Section 2. 6. A soft silvery lustrous element belonging to the lanthanide series. 9. A community of living things and their relationship to their surroundings. 10. A period of change in behaviour or physiology of many animals and plants. 11. Lack of propriety or good taste. 12. An event causing tremendous change or upheaval. 14. A private cabin or compartment with sleeping accomadation on a ship or train.