If you were told that concentrations of trace elements above what is required by organisms generally have no effect on those organisms, what would you say?

• A. True. Most organisms have evolved adaptations that allow them to tolerate very high concentrations of trace elements in the environment.
• B. True. Only trace element limitation can lead to disease among organisms.
• C. False. Increasing the concentration of trace elements above what is required generally has a beneficial effect on organisms.
• D. False. Elevated concentrations of some trace elements such as cobalt and chromium can be toxic.