Research the fossil record of humans and answer these questions: 1. Name at least two extinct species that share a close evolutionary relationship with humans.
2. Explain the similarities and differences that exist between these species and humans.

3. Is the fossil record complete for humans? Explain your answer.

Which statement about relative potential energy of electrons is correct? a. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 2 s orbital of the second electron shell. b. an electron in the 2 p orbital of the second electron shell has more potential energy than an electron in the 3 p orbital of the third electron shell. c. an electron in the 3 p orbital of the third electron shell has more potential energy than an electron in the 2 p orbital of the second electron shell.