Answer:
The similarity is on the basis of evolution.
Step-by-step explanation:
Due to the process of evolution, the early earth's atmosphere becomes favourable for lives. It took several years. Then the organic molecules, living animals came from nonliving elements. It is because of the chemical reaction between them, thunder, lightning. Then, the unicellular organisms came to existence from pre-biotic soup. From the unicellular animals, multi-cellular organisms and human beings came. The humans came from ape-like ancestors. These all process took a long time and no direct eyewitness of it. We know it from indirect and direct scientific evidence. Evolution is a slow and continuous process. Thus the changes in the earth and in the human being are similar.