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What is the proper identification of a single layer of flat cells?

If given the following 4 organisms: leopard with 5 traits, turtle with 4 traits, tuna fish with 3 traits, and a lamprey with 1 trait, which organism might be considered the “outgroup”?

Five species (V, W, X, Y, Z) are being compared based on the presence or absence of five derived traits. The following observations were made: Species Y lacks all derived traits and serves as a baseline for comparison. Species V and W share three derived traits, making them very similar. Species Z shares some traits with both species V and W but has fewer traits overall. Species X has two unique traits that distinguish it from the others. Which of the following statements best describes the evolutionary relationships among these species?

What are pedicellariae in starfish?

What is autonomy in sea stars?

Which of the following is the most common intestinal parasite in the United States?

Which of the following organisms is not a parasitic roundworm?

What happens to the blastopore in protostomes during development?

How do mutations lead to evolutionary change?

How do pearls form in bivalves?