What is shown on the x-axis, and in what units?

Question

the calcification rate in micromoles per kilogram of seawater
the calcium carbonate (CaCO3) concentration of seawater, in micromoles per kilogram of seawater
the calcification rate in millimoles of calcium carbonate (CaCO3) accumulated per square meter of reef per day
the carbonate ion (CO3 2-) concentration of seawater, in micromoles per kilogram of seawater
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Part B
What is shown on the y-axis, and in what units?

the calcification rate in millimoles of calcium carbonate (CaCO3) accumulated per square meter of reef per day
the total calcium carbonate (CaCO3) accumulation on the reef in millimoles per day
the calcification rate in millimoles of carbonate ion (CO3 2-) accumulated per square meter of reef per day
the carbonate ion (CO3 2-) concentration of seawater, in micromoles per kilogram of seawater
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Part C
Which variable is the independent variable in this experiment--the variable that was manipulated by the researchers?

carbonate ion concentration in the seawater
calcification rate
the surface area of the reef
how many days the reef was measured
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Part D
Which variable is the dependent variable--the variable that responded to or depended on the treatment, and was measured by the researchers?

carbonate ion concentration in the seawater
calcification rate
the surface area of the reef
the acidity of the seawater
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Part E - Reading the graph
Based on this graph, what is the relationship between carbonate ion concentration and calcification rate?

As the acidity of the seawater is increased, the rate of calcification decreases.
As the concentration of carbonate ions is increased, the rate of calcification decreases.
As the rate of calcification is increased, the concentration of carbonate ions increases.
As the concentration of carbonate ions is increased, the rate of calcification increases.

Answer 1

Based on the questions you've provided, I can help deduce the answers.

Part A: What is shown on the x-axis, and in what units? The x-axis represents the variable that is manipulated or controlled in the experiment. Given the options, it is most likely:

• The carbonate ion (CO3 2-) concentration of seawater, in micromoles per kilogram of seawater.

Part B: What is shown on the y-axis, and in what units? The y-axis represents the variable that is measured in response to the manipulation of the independent variable. Given the options, it is most likely:

• The calcification rate in millimoles of calcium carbonate (CaCO3) accumulated per square meter of reef per day.

Part C: Which variable is the independent variable in this experiment? The independent variable is what the researchers manipulate in the study. Thus, from the choices provided, it is:

• Carbonate ion concentration in the seawater.

Part D: Which variable is the dependent variable? The dependent variable is what the researchers measure in response to changes in the independent variable. Therefore, it is:

• Calcification rate.

Part E - Reading the graph: The relationship you are asked about pertains to how the dependent variable responds to changes in the independent variable. Based on typical ecological relationships, if the graph shows a positive correlation:

• As the concentration of carbonate ions is increased, the rate of calcification increases.

To conclude:

• Part A: Carbonate ion (CO3 2-) concentration of seawater, in micromoles per kilogram of seawater.
• Part B: Calcification rate in millimoles of calcium carbonate (CaCO3) accumulated per square meter of reef per day.
• Part C: Carbonate ion concentration in the seawater.
• Part D: Calcification rate.
• Part E: As the concentration of carbonate ions is increased, the rate of calcification increases.