A *life support system* is defined as the interrelationship between living beings and environment.
Answer:
The orbit of the Earth
Explanation:
It is widely speculated that orbital mechanics were responsible for the period of lushness that the Sahara desert and Northern Africa lived only 6000 years ago. Due to the changes in the Earth's orbit around the Sun, it is thought that the monsoon effect (season variations in wind patterns that produce a heavy rainy season) was more pronounced across the northern latitudes and resulted in the Sahara being much wetter than it is today.
A the Appalachian mountains and costal plain
T<span>he most important inventions for spreading European influence would be the method of getting quinine from cinchona tree bark, the Maxim gun, and the Repeating Rifle. The method of getting quinine would be because malaria had been a large problem in central Africa and someone was able to cure it, The Africans would believe that they were more powerful than they had thought. The two guns also could spread influence through force if they were not willing to listen.</span>
