Living longer

4. A person who studies genetics.
6. A part that combines with other parts to form something bigger.
7. To interest someone a lot, especially by being strange, unusual, or mysterious.
9. An official limit on something.
10. Related to the history of the past and present members of a family or families.
13. The act or process of bringing together or combining things or people.
14. To spoil something, making it less good or less enjoyable.
16. Relating to molecules (= the simplest units of a chemical substance).
17. Someone who is a 100 years old or more.

1. In a way that shows great care and attention to detail.
2. Relating to the study of populations and the different groups that make them up.
3. A way of doing something that is planned or part of a system.
5. A person's family history, education, and experience, or the history of an idea or activity.
8. Connected with the cells of a plant or animal.
11. Physical or mental weakness.
12. In a way that is extremely great in ability, amount, or strength.
15. All the chemical processes in your body, especially those that cause food to be used for energy and growth.