What is the chemical formula for the carbonate ion mentioned in the experiment?

• CO2

• CaCO3

What is the predicted effect of higher atmospheric CO2 on the concentration of dissolved carbonate ions in seawater?

• It will lower the concentration

• It will increase the concentration

• It will have no effect

• It will double the concentration

What is the dependent variable in the experiment described?

• Calcification rate

• Temperature

• pH level

• Amount of light

What units are used for the y-axis in the scatter plot?

• mmol CaCO3/m^2/day

• μmol/kg of seawater

• g/L of seawater

• mg/L of seawater

What is the relationship between carbonate ion concentration and calcification rate, as shown in the data?

• Positive correlation

• Negative correlation

• No correlation

• Inverse correlation

What does the x-axis in the graph represent?

• Carbonate ion concentration

• Calcification rate

• Temperature

• pH level

What does the red line in the scatter plot indicate?

• The best-fitting trend in the data

• The average temperature

• The maximum calcification rate

• The minimum carbonate concentration

What is the result of less CO₃²⁻ being available in the ocean?

• More oxygen is produced

• More calcium carbonate (CaCO₃) is formed

• Less calcium carbonate (CaCO₃) is formed

• More carbon dioxide is released

What is the chemical formula for carbonate ion?

• CO₃²⁻

• HCO₃⁻

• CaCO₃

• H₂CO₃

What is the effect of increased atmospheric CO₂ on the availability of carbonate ions in the ocean?

• Increases carbonate ion concentration

• Decreases carbonate ion concentration

• Has no effect

• Increases oxygen concentration