Final answer:
The passage principally discusses an aquarium housing diverse marine animals, correlating with content on marine ecosystems and human environmental impact.
Step-by-step explanation:
The sentence that best describes the given passage is that it discusses an aquarium that is home to many kinds of marine animals. This option directly relates to the subject matter outlined in the referenced materials, which includes a focus on marine ecosystems, human impacts on the environment, and considerations relevant to the maintenance of healthy aquatic habitats. The two incorrect options do not align with the information provided, as there is no mention of human visitors to the aquarium or the various ways to create a beautiful aquarium in the context of the provided excerpts.