Let's analyze the problem step-by-step by considering the contractile vacuole contractions per minute for different saturation concentrations outside the paramecium:
1. Given Data Analysis:
[tex]\[
\begin{array}{|c|c|}
\hline
\text{Saturation Concentration} & \text{Contractions per minute} \\
\hline
\text{Very high} & 2 \\
\hline
\text{High} & 8 \\
\hline
\text{Medium} & 15 \\
\hline
\text{Low} & 22 \\
\hline
\text{Very low} & 30 \\
\hline
\end{array}
\][/tex]
2. Statement Verification:
- "The graph has five bars of equal height."
By observing the values (2, 8, 15, 22, 30), it is clear that the heights of the bars are not equal.
- "The bars range from tallest for very high concentration to shortest for very low concentration."
Contrary to this statement, "Very high" has the fewest contractions (2), and "Very low" has the most (30). The bars do not decrease in height as the concentration decreases.
- "The bar for very low concentration is twice the height of the bar for medium concentration."
Let's verify:
[tex]\[
\text{Contractions for Medium} = 15
\][/tex]
[tex]\[
\text{Contractions for Very Low} = 30
\][/tex]
We see that:
[tex]\[
30 = 2 \times 15
\][/tex]
This statement is correct.
- "The bar for very high concentration is five times the height of the bar for very low concentration."
Let's verify:
[tex]\[
\text{Contractions for Very High} = 2
\][/tex]
[tex]\[
\text{Contractions for Very Low} = 30
\][/tex]
Now checking if:
[tex]\[
2 = 5 \times 30
\][/tex]
This is clearly incorrect as [tex]\(2 \neq 150\)[/tex].
Conclusion:
The statement that correctly describes the bars on a bar graph representing the data is:
- "The bar for very low concentration is twice the height of the bar for medium concentration."
