This and that of the beginning and end.

 1. Criteria for judging the evolution of mankind.

 

  Darwin said that the biggest difference between humans and animals is that they have the skills to walk on two feet, make tools, and have a big brain. He also argued that when people evolve, these three evolve together. Therefore, the degree to which humanity has evolved is judged based on whether it walks upright, whether the technology for making tools has developed, whether the size of the brain has grown, and whether the size of the brain is similar to that of the present person.

 

2. Place where fossils are found.

 

  Since the place where human fossils are found is determined, it is often compared to finding needles in the sand. The bones of living things gradually become fossils as minerals permeate into the bones deep enough to prevent oxygen from passing through. When it meets oxygen, the bones of dead creatures easily rot and are not properly preserved. Therefore, fossils are often found hundreds of meters below the surface. However, it does not mean that fossils exist anywhere deep in the ground. In order to become a fossil, conditions are very difficult, such as no bone-damaging water in the ground and no acidity in the soil.

 

3. Humanity is evolving.

 

  Humans are still evolving through physical changes, such as gradually changing bone shapes to adapt to the climate today. So people say this about future human evolution.

  "People think a lot, so more people have excellent brains. And the head will grow and the bald head will stretch. However, as the amount of activity decreases, the hands and feet will become smaller and the eyes will continue to deteriorate."

  However, some disagree with this argument. This is because civilization has developed rapidly over the past 100,000 years, but the size of the human brain has remained the same. What's the right opinion?