Select the most correct statement.
a. the immune system is closely associated with the lymphatic system.
b. the endocrine system is not a true structural organ system.
c. organ systems operate independently of each other to maintain life.
d. organ systems can be composed of cells or tissues, but not both.

What word is used to describe differences of individual organisms

The pronunciation aid that determines the stress placed upon a syllable is the

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.