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1 Normally, the appendix sits in the lower right abdomen. The function of the appendix is unknown. One theory is that the appendix acts as a storehouse for good bacteria, “rebooting” the digestive system after diarrheal illnesses. Other experts believe the appendix is just a useless remnant from our evolutionary past.
2 Wisdom teeth were necessary for earlier humans to chew and eat. ... Over time, the types of food we eat have changed, so they are no longer necessary. As a result of evolution over time, some people never develop them at all. Some do develop them, but have no problems.
3 the real reason is that an asteroid crashed on earth which led to the increased pace of climatic changes which got unbearable for the animals at that time
4 Habitat destruction as farming land expands and forests are cut-down is the main cause of modern extinctions, along with pollution, the introduction of alien species, and over fishing or hunting. Increasingly, however, climate change is thought to be driving extinctions.