Barnacles (Hard-Shelled Marine Invertebrates) Live on Rocks in the Intertidal

Multiple Choice

Barnacles (hard-shelled marine invertebrates) live on rocks in the intertidal zone.Two species in an experiment, Semibalanus balanoides and Chthamalus stellatus, were able to coexist.S.balanoides grew rapidly and crushed the slower-growing C.stellatus.However, C.stellatus tolerated dry conditions.These species therefore existed in two distinct high and low bands in the intertidal zone, with C.stellatus living in the drier area above S.balanoides.These results suggest the two barnacle species coexist because of

A) character displacement.
B) similar realized niches.
C) different realized niches.
D) lack of interference competition.
E) lack of interspecific competition.