By studying the fossil record we can tell how long life has existed on Earth, and how different plants and animals are related to each other. Often we can work out how and where they lived, and use this information to find out about ancient environments. Fossils can tell us a lot about the past.
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B. The requirement that all decisions and actions taken by the League required unanimous agreement amongst the member countries.
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It gave them less resources for them to have. It hurt people there.
Battle of Somme - 800 thousand French and 540 thousand German soldiers (total: 1 million 340 thousand)
At the battle of Verdun - 150 thousand French and 150 thousand German soldiers (Approximately, total of 300 thousand)
Battle of Ypres: 100 000 French and 10 000 German casualties.
Total for all battles: 1 million and 700 thousand
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I'm pretty sure the Aurora Astralis is referred to as the Southern Lights or the Southern Polar Lights.