Which of the following is NOT a true statement about soil microorganisms? A. Microorganisms can be used for medicinal purposes. B. Microorganisms can use oxygen, sulfur, iron or nitrogen to respire. C. Microorganisms can cause disease in plants, animals and humans. D. Microorganisms cannot decompose organic matter.

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.