Question

read the passage about kelp forest ecosystems.
just as trees grow in forests on land, large brown algae called kelp can grow in dense clusters in the ocean. these kelp forests grow best in cold, nutrient - rich waters. because of their dependence on light for photosynthesis, kelp forests form in shallow, open ocean.
the kelp within kelp forests are considered foundation species by many scientists. foundation species heavily influence their biological community by making a physical impact on the environment.
inside kelp forests, ocean currents are dramatically slowed by the drag of the algae. the relatively calm environment within a kelp forest provides refuge for many kinds of fish and invertebrates. a variety of aquatic organisms use kelp to shelter their young from predators or rough storms. even mammals and birds use kelp forests for protection and feeding! an additional benefit of the drag created by the kelp is that it decreases wave action onshore, reducing coastal erosion and protecting coastline habitats from storm damage.
it is largely thanks to the physical impact that kelp species have on their environment that kelp forest ecosystems are able to provide food and shelter to such a wide variety of plants and animals. when these foundation species are disturbed, however, there can be cascading effects impacting the entire ecosystem.
among the many organisms that live in kelp forests are primary consumers that feed on the kelp. sea urchins are particularly voracious consumers of kelp. in an undisturbed kelp forest ecosystem, predators like sea otters, sea stars, and california sheephead fish keep the sea urchin population in check. but when predator populations are diminished, sea urchin grazing increases. when sea urchins graze in large numbers, they can eat away at a kelp forest until theres almost nothing left. this creates a deforested area called an urchin barren.
which location would be the most likely to have a kelp forest?
at the bottom of the mariana trench, the deepest oceanic trench on earth, where no sunlight can reach.
off the coast of california, where the water that rises to the surface as a result of upwelling is typically cold and rich in nutrients.
near the shore of lake superior, the worlds largest freshwater lake by surface area and the coldest freshwater lake in the united states.
in the gulf of mexico, where warm water flows in from the caribbean sea and many rivers, including the mississippi river, deposit sediments and nutrients.

Explanation:

The passage states that kelp forests grow best in cold, nutrient - rich waters and form in shallow, open ocean. The location off the coast of California has cold water (due to upwelling) and is nutrient - rich, which meets the requirements for kelp forest growth. The Mariana Trench has no sunlight (kelp needs light for photosynthesis), Lake Superior is freshwater (kelp is marine), and the Gulf of Mexico has warm water (kelp prefers cold).

Answer:

Off the coast of California, where the water that rises to the surface as a result of upwelling is typically cold and rich in nutrients.