Answer: C). A tsunami would decrease abundance by causing physical damage to the organisms and their ecosystems.
An intertidal zone is also known as littoral zone. It is the region which is covers the foreshore and seabed. This region is exposed to the affects of tides. This region is highly vulnerable to tsunamis. The tsunami will disturb the habitat of organisms living in intertidal zone. Therefore, will result in decrease in abundance of aquatic organisms.
The best and most correct answer among the choices provided by the question is the fourth choice "A tsunami would decrease abundance by concentrating the salinity of the water near where it made landfall."
Tsunamis<span> scrape seafloor sediments and invertebrates, crash through coral reefs and destroy coastal vegetation.</span>
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