In Subarctic Saltmarshes,scientists Have Found That the Addition of Calcium

question 29

Multiple Choice

In subarctic saltmarshes,scientists have found that the addition of calcium has no effect on productivity,but additional iron does increase productivity.In this example,iron

• A)is a precursor to calcium.
• B)stimulates evapotranspiration.
• C)biomagnifies in the marsh plants.
• D)is a limiting factor.
• E)blocks the effect of calcium.