Use the Following Information to Answer the Question

question 83

Multiple Choice

Use the following information to answer the question.
An elementary school science teacher decided to liven up the classroom with a saltwater aquarium. Knowing that saltwater aquaria can be quite a hassle, the teacher proceeded stepwise. First, the teacher conditioned the water. Next, the teacher decided to stock the tank with various marine invertebrates, including a polychaete, a siliceous sponge, several bivalves, a shrimp, several sea anemones of different types, a colonial hydra, a few coral species, an ectoproct, a sea star, and several herbivorous gastropod varieties. Lastly, she added some vertebrates-a parrot fish and a clown fish. She arranged for daily feedings of copepods and feeder fish.
Normally, the clown fish readily swims among the tentacles of the sea anemones; the parrot fish avoids them. One hypothesis for the clown fish's apparent immunity is that they slowly build a tolerance to the sea anemone's toxin. A second hypothesis is that a chemical in the mucus that coats the clown fish prevents the nematocysts from being triggered. Which of the following graphs supports the second, but not the first, of these hypotheses?

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Definitions:

Main Uses Of Freshwater

Primary purposes include drinking, irrigation, sanitation, and industrial processes, highlighting the essential nature of freshwater for life and society.

Water Available For Use

The quantity of water that is accessible for specific uses, such as agriculture, industry, and domestic purposes.

Usable Water

Water that is safe and suitable for human use, including drinking, cooking, and bathing.

Desalination

The process of removing salt and other minerals from seawater to make it suitable for drinking and irrigation.