1 someone who lives forever: immortal

2 someone who is a hundred years old or more: centenarian

3 working or operating quickly and effectively in an organized way: efficient

4 a green, brown, or dark red plant that grows in the sea or on land very close to the sea: seaweed

5 eat or drink, especially a lot of something: consume

6 the length of time that a living thing, especially a human being, is likely to live: life expectancy

7 able to be reached or easily got: accessible

8 not having or earning much money: low-income

9 a person who is a member of a particular country and who has rights because of being born there: citizen

10 caused by: due to

11 the people living in one particular area or people who are considered as a unit because of their common interests, social group, or nationality: community

12 the fact of being extremely fat, in a way that is dangerous for health: obesity

13 a sudden change in the blood supply to a part of the brain, sometimes causing a loss of the ability to move particular parts of the body: stroke

14 change food in your stomach into substances that your body can use: digest

15 speak too proudly or happily about what you have done or what you own: boast

16 necessary or needed: essential

17 decide which of a group of things are the most important so that you can deal with them first: prioritize

18 say that something is the result of a particular thing: attribute

19 any drug that has an effect similar to opium, such as morphine: opioid