Figure 54-1 ​

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In Experimental Condition 1 of the accompanying figure, the distribution of Balanus suggests that:

A) interspecific competition kept Balanus from extending higher into the intertidal area.
B) intraspecific competition kept Balanus from extending higher into the intertidal area.
C) an unfavorable environmental factor kept Balanus from extending higher into the intertidal area.
D) Balanus is less motile than Chthamalus .
E) Balanus is more motile than Chthamalus .