Why is the barnacle Chthamalus found only in the upper regions of the intertidal zone?
A) It cannot live at the bottom of the zone where oxygen levels are low.
B) Interference competition from another barnacle, Semibalamus, prevents adults from persisting at the bottom of the zone.
C) Exploitative competition from another barnacle, Semibalamus, prevents adults from persisting at the bottom of the zone.
D) Its larvae are able to survive only in the upper intertidal zone.
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