Heredity
Heredity is the transfer of biological characters from one generation to the next through genes. **
Vestigial Organs
Degenerated or underdeveloped useless organs of organisms are called as vestigial organs. 5
Fossils
Large number of organisms get buried due to disasters like flood, earthquake, volcano, etc. Remnants and impressions of such organisms remain preserved underground. These are called as fossils. 5