Answer:
1. By refrigerating it(You can also add salt cuz salt acts as a preservative)
2. I have no clue
3. Biodegradable is a characteristic of an object which can decompose by the nature itself
4. Seven
5. Uhhmmm?
6. Both are necessary for a healthy diet (Also you haven't mentioned which meat) Meat like fish are good but mutton or chicken's meat are not specifically bad but you should try reduce the amount you eat
7. Kinda explained that in 6.
8. Population of eagles??????? It could reduce the population of birds but not really though. Well you mi6say birds live on trees but at the same time birds are not trees, the could just go to a far away place where human habitat is low or just migrate away
9. Yes it would be good. smoking does not only ruin the person who is smoking but also the people nearby.
10. Do it yourself