Ninety percent of all marine species can be found in the __________.

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BlackTom AI · Accepted Answer

Starting with the question, we are asked about where 90 percent of all marine species can be found, so we should compare the geographic or habitat regions listed.
Option 1: Intertidal zones. These zones are rich in life and highly productive, but they do not host the majority of marine species because many organisms live deeper or more offshore; intertidal areas are just a portion of the coastal environment.
Option 2: Open seas. The open ocean does host vast numbers of organisms, especially plankton and pelagic species, yet the great majority of marine biodiversity is concentrated closer to the coastline, down in the continental shelves, not uniformly in the deep open ocean.
Option 3: Abyssal zone. This deepest part of the ocean is home to specialized life, but it contains far fewer species compared to shallower habitats due to extreme pressure, low temperatures, and limited food input; it does not support 90% of marine life.
Option 4: Bathyl zone. This term refers to a broad depth range within the deep sea, but like the abyssal zone, it is not where most marine species accumulate; its conditions are too extreme and food-poor for the majority of biodiversity.
Option 5: Coastal zones. These include shallow, sunlit waters over continental shelves and nearshore habitats, which are among the most biodiverse and productive regions in the ocean due to nutrient inputs, photosynthetic bases, and complex habitats. This abundance of resources supports a vast array of species, making coastal zones the correct context for housing the majority of marine life.
In summary, while many regions host diverse life, the coastal zones stand out for their high productivity and species richness, aligning with the statement about 90 percent of marine species being found there. The other zones, though important and biologically significant, do not support as large a share of total marine biodiversity.

11:375:101:91 INTRO ENV SCIENCE Quiz #12

Ninety percent of all marine species can be found in the __________.

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