In a field experiment, when all the starfish Pisaster were removed from an enclosed intertidal area, more than ..a..species of ..b…becomes extinct within ..c…because of …d…

Options

A. a`-`200, b`-`vertebrates, c`-`a year, d`-`interspecific predation
B. a`-`10, b`-`invertebrates, c`-`a decade, d`-`interspecific predation
C. a`-`10, b`-`invertebrates, c`-`a decade, d`-`interspecific competition
D. a`-`10, b`-`invertebrates, c`-`a year, d`-`interspecific competition.

Answer

D

Explanation

a) In the rocky intertidal communities of the American Pacific, Coast, the starfish(Pisaster) is an important predator.
In a field experiment, when all the starfish Pisaster were removed from an enclosed intertial area, more than 10 species of invertebrates become extinct within a year because of interspecific competition.