Question 1 • EF Environmental Science 1st Nine Weeks
When the comb jelly, Mnemiopsis leidyi, was introduced into the Black Sea, its population exploded to 500 comb jellies per cubic yard in 1988. The jellies devoured all the zooplankton and fish larvae, drastically reducing the numbers of the native fish populations. This situation demonstrates _______.
Answer
A
the difference between biotic and abiotic factors in an ecosystem.
B
effects of local evolution or migration on an ecosystem.
C
the impact of removing or adding organisms to an ecosystem.
D
the types of interactions between organisms in an ecosystem.
Explanation
The comb jelly was introduced into the Black Sea, adding a new organism to the ecosystem. Its population grew rapidly and reduced zooplankton and fish larvae, which affected native fish populations. This demonstrates the impact of adding organisms to an ecosystem, so the correct choice is “the impact of removing or adding organisms to an ecosystem.”
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