Question

Which of the following four statements, if any, is true regarding essential elements and living organisms? ANSWER Unselected All of the listed responses are true. Unselected The elements carbon, hydrogen, nitrogen, and oxygen make up 20–25 percent of living mass. Unselected All organisms require 25 of the 92 naturally occurring elements to survive. Unselected Although all forms of life require iron, other elements are required only by certain species. Unselected Given their low concentrations in nature, the toxicity of some elements is generally not a factor in the evolution of biological communities.

          Which of the following four statements, if any, is true regarding essential elements and living organisms?
ANSWER
Unselected
All of the listed responses are true.
Unselected
The elements carbon, hydrogen, nitrogen, and oxygen make up 20–25 percent of living mass.
Unselected
All organisms require 25 of the 92 naturally occurring elements to survive.
Unselected
Although all forms of life require iron, other elements are required only by certain species.
Unselected
Given their low concentrations in nature, the toxicity of some elements is generally not a factor in the evolution of biological communities.

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