The answer that contributes to Mars's cool temperatures is the third choice - Its thin atmosphere and distance from the Sun.
Mars is relatively distant from the Sun - it is the fourth planet away from the Sun which means that it can be quite cold there given that its atmosphere is quite thin which means that the cold is quite present there.
It was closely linked to the natural world
1. Mostly trees as growth
2. Blinking your eyes
3. putting together puzzles
4. one event caused by another
5. mouth watering when smelling good food
6. brushing your teeth
7. all green plants
8. migration
9. Humans
10. biome caused by dryness
11. most northern biome
12. home of bison and deer
13. grouping of plants and animals
14. Bacteria