Use the Following Information to Answer the Question

question 60

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.
The teacher and class were especially saddened when the colonial hydrozoan died. They had watched it carefully, and the unfortunate creature never even got to produce offspring by budding. Yet, everyone was elated when one of the students noticed a small colonial hydrozoan growing in a part of the tank far from the location of the original colony. The teacher was apparently unaware that these hydrozoans exhibit ________.

• A) spontaneous generation
• B) abiogenesis
• C) alternation of generations
• D) a medusa stage

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Definitions:

Sagittal

Relating to or in a plane that divides the body into right and left portions.

Ischemic Stroke

A type of stroke caused by an obstruction within a blood vessel supplying blood to the brain, leading to tissue damage.

Clot

A thickened mass of blood that forms in the circulatory system and is essential for stopping bleeding (hemostasis), but can be harmful if it blocks blood flow.