1.What percentage of the world's marine life is found in coral reefs? (1 point) 2.Humans rely on coral reefs for , , and . (3 points)

3.Name two types of medication that have been developed from coral reefs. (2 points)

4.Coral reefs are facing many dangers and may disappear in the next 30-50 years due to these dangers. List five of the dangers mentioned in the video. (5 points)

In what way are cities microclimates?

What is the difference between bacterial infections and viral infections?

1. emigration the movement of people from one place to another 2. immigration a situation in which resources are being used up at a faster rate than they can be replenished 3. migration the leaving of one's homeland to settle in a new place 4. overpopulation the movement of people to a new country 5. sustainable development a situation in which the birth rate is not sufficient to replace the existing population 6. underpopulation the ability to meet current needs without reducing the ability to meet future needs 7. unsustainable development the increase in the population of a city 8. urbanization a situation in which the number of people exceeds the available natural resources in an area