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.

Answer: (D)

Verified step by step guidance

1. Begin by understanding what trace elements are. Trace elements are minerals present in living tissues in small amounts and are essential for various physiological functions.
2. Consider the role of trace elements in the body. While they are necessary for health, they must be maintained within a specific range. Both deficiency and excess can lead to health issues.
3. Evaluate the statement that elevated concentrations of trace elements have no effect. This is incorrect because many trace elements can become toxic when their concentrations exceed the required levels.
4. Examine specific examples of trace elements like cobalt and chromium. These elements, when present in high concentrations, can lead to toxicity and adverse health effects.
5. Conclude that the correct answer is 'False' because elevated concentrations of certain trace elements can indeed be harmful to organisms, contrary to the statement that they have no effect.