Choose the best description of an umbra.

a. ring of light around an opaque object

b. a partial shadow

c. the darkest part of a shadow

d. an opaque object

Match each symbol with its description.

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.

Explain how the parts of the peripheral nervous system work with the central nervous system to produce a response to the stimulus