Why is the greenhouse effect and the destruction of the ozone layer often mistaken for the same environmental issue ? Briefly describe in 5 sentences

I’m doing some practice exam questions for biology, and i’m not sure how to do these 3 parts to the question.

Building glycogen from glucose molecules is an example of what

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