The organisms shown in the pictures above can be categorized based on structural similarities and differences.

Question

Part A: Based on similarities in their internal structures, name a category to which organism X and organism Z belong, but to which organism Y does not. Explain your reasoning.

Part B: Using the same classification scheme you selected for Part A, identify another organism that would be categorized into the same group as organism Y. Explain your reasoning.

Answer 1

Part A: Organism X and organism Z belong to the category of vertebrates, while organism Y does not. This categorization is based on the presence of a spinal column or backbone, which is present in both organism X and organism Z but absent in organism Y.

Part B: Another organism that would be categorized into the same group as organism Y would be an invertebrate. This is because organism Y does not possess a spinal column or backbone, which is a defining characteristic of vertebrates. Invertebrates, on the other hand, do not have a backbone. Thus, organism Y would fall into the category of invertebrates based on this classification scheme.