A Primary School Science Teacher Decided to Liven Up the Classroom

Multiple Choice

A primary 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 bivalves started to die one-by-one; only the undamaged shells remained. To keep the remaining bivalves alive, the teacher would most likely need to remove the ________.

A) sea anemones
B) sea star
C) gastropods
D) ectoprocts