Lab: Interdependence of Organisms Answers

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

number of seeds sprouted✔ plant growthworm growth

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

number of worms✔ plant growthnumber of dead plants

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 smaller fish speciestitan triggerfish prey species

are benefited by the smaller fish speciestitan triggerfishprey species.

The triggerfish are helpedharmedneither harmed nor helpedboth harmed and helped.

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