Two Species of Barnacles, Stellate and Rock Barnacles, Occupy the Rocky

question 236

Multiple Choice

Two species of barnacles, stellate and rock barnacles, occupy the rocky intertidal zone of the Scottish coast and illustrate factors that can determine species distribution in a community.Larvae of both species settle throughout the intertidal zone, but adult barnacles occupy specific zones.The smaller stellate barnacle lives only in higher zones, where the environment dries out between high tides.The larger, faster-reproducing rock barnacle lives only at lower zones.If rock barnacles were entirely removed from this community, what would most likely happen to the population of stellate barnacles?

• A) They would go extinct.
• B) They would leave the community.
• C) There would be little or no change in their population.
• D) They would expand their range to include both the low and high areas.
• E) They would remain at high levels, and their population would increase.

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Definitions:

Paleoanthropology

The branch of anthropology focused on the study of ancient humans and their relatives through fossils and other physical remains.

Absolute Dating

A method of determining the specific date of an archaeological or paleontological site or artifact, using techniques such as radiometric dating.

Relative Dating

A technique used in archaeology and geology to determine the chronological sequence of historical or geological events by comparing them to other events.

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