An example of a biotic factor that may influence the abundance of a population of bivalve molluscs on a rocky shore is the
A) height of the bivalves on the shore relative to the low tide mark.
B) average velocity of waves striking the rocks on which the bivalves live.
C) salinity of the sea water in which the bivalves live.
D) number of people who regularly collect the bivalves for food.
E) temperature of the water.
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