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What is the name of the interestingly-shaped skeletal structure found in the center of a sea urchin?

Write an organized essay of 500 to 600 words in response to the question below. The purpose of this diagnostic essay exam is to assess your writing skills at the beginning of the course. I want to see how you write and what you think a college essay looks like. Your essay MUST meet the word count to qualify as complete.

Which of the following features distinguishes the ratites from carinates?

What is the bridge thread of a spider web used for?

Which type of zoology involves the study of animal behavior?

Which of the following correctly describes the crocodilian heart structure?

Describe the purpose and location of the following parts of a ray-finned fish: caudal fin, dorsal fins, operculum, gills, pectoral fin, mouth, pelvic fins, lateral line, and anal fin.

Agnatha, the earliest vertebrates, are considered more primitive compared to Gnathostomata, which evolved later. Agnatha species are mostly scavengers or parasites, such as lampreys, which latch onto other fish to feed. Gnathostomata, with their jaws, dominate aquatic and terrestrial ecosystems. This group includes predators like sharks, and herbivores like grazing fish. Additionally, Gnathostomata possess more advanced skeletal systems, often with bones or cartilage providing robust support. Based on this evolutionary context, which of the following features is exclusive to Gnathostomata but absent in Agnatha?

Which of the following is not true of starfish?

Below is a cladogram, use the information in the diagram to the answer the question. Which listed characteristic would be considered apomorphic?