Question

In the 1960s study of barnacles in Scotland, summarized in Figure 54-4 below, it was concluded: Chrhamatus Balans Level of Nghest de NOSOROS Level of lowest side! Control Experimental Condition 1 - removal of Chthamalus Experimental Condition 2 removal of Balanus Select one: a. that Balanus is less motile (mobile) than Chthamalus. b. that intraspecific competition kept Balanus from extending higher into the intertidal area. c. that an unfavorable environmental factor kept Balanus from extending higher into the intertidal area. d. that Balanus is less aggressive than Chthamalus. e. that interspecific competition kept Balanus from extending higher into the intertidal area.

Answer 1

Answers is

E. Interspecific competition kept Balanus from extending higher into the intertidal area.

Explanation: Because in the experiment 2 where Balanus removed, Chthamalus takes level of lowest side (place of Balanus). This indicates the presence of Balanus may not allowing Chthamalus to come to the level of lowest side.

Explanations for wrong answers.

A. We can't predict motility from the given information. If Balanus was less motile than it was expected that more motile Chthamalus would have been come to the level of lowest side in the control experiment.

B. They belongs to different species.

C. Level of lowest side is the natural place of habitat for the Balanus.

D. Aggressiveness can not be predicted from the given information.