are substances that may have harmful effects on a developing embryo or fetus.

What is usually (but not always) related to the metabolic processes of living organisms in its organic form?

Which of these is not a nucleotide base found in dna?

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.