Extinction is the dying out of a species. What can lead to the extinction of a species if the environment changes?
A.
B.
sexual reproduction within a species
a lack of adaptations within a species
an increase in the reproductive rate within a species
the presence of genetic variations among a species
C.
D.

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.