Lab: Interdependence of Organisms Answers

In this experiment, you changed the and measured the effect of this change on the in the population.

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The independent variable was the , and the dependent variable was the .

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cm taller than plants growing without worms in the soil.

The graph to the right represents the data of this lab using a . The bars best represent the groupwithout worms, and the bars represent the growth of plants with worms.

In this lab, you collected data at the end of Weeks 1, 3, and 5. Suppose you had collected data every day for five weeks instead. Why would a line graph be a better format for this data than a bar graph? Check all that apply.

Check all strategies below that helped you decrease experimental error in this lab.

The results of this experiment show that plants grow more in soil containing worms than in soil without worms. Which factors below helped the plants grow taller? Check all that apply.

Titan triggerfish feed on coral, which is often buried under rocks on the sea floor. To access the coral, these fish turn over rocks. It has been shown that the absence of the titan triggerfish changes the population levels of other species of fish that live in the same coral-reef environment.One can conclude that the

Do the data shown support the hypothesis?

How could increasing the number of plants help you decrease error in the experiment? Check all possible reasons.

are benefited by the .

The triggerfish are .

Why does the y-axis of the graph show average height instead of the heights of all twelve individual plants?

The relationship of the triggerfish and other fish is an example of .