Stimulants are a drugs that speed up activity in the central nervous system. b drugs capable of influencing perception, mood, cognition, or behavior. c drugs that slow down activity in the central nervous system. d drugs derived from the opium poppy that relieve pain and produce euphoria.

The skeletal system performs a variety of functions that are crucial to maintaining life processes. what function is performed in the bone marrow, but not in the ossified bones of the skeleton? a oxygen transportation c mineral storage b. muscle attachment d red blood cell production

Astudent drew the following flowchart to show the movement of nutrients. soil → roots → plants →? where does nitrogen go next? a. directly into nearby animals as nutrition b. directly into aquifers through condensation c. directly into the air through evaporation d. directly into nearby plants during fixation

Human genes only differ by less than percent. a. 1 b. 6 c. 11 d. 16