Use the Following Information to Answer the Question

question 32

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:

Archean

A geological eon extending from about 4.0 to 2.5 billion years ago, characterized by the formation of the Earth's first stable continental crust.

Hadean

The earliest eon in Earth's history, marked by extreme heat and uninhabitable conditions, spanning from about 4.6 to 4 billion years ago.

Prokaryotes

Microorganisms characterized by the absence of a nucleus, including bacteria and archaea.

Representatives

Individuals or entities that stand in for or act on behalf of others in a particular context or scenario.