Which animal phylum is characterized by a segmented body, jointed appendages, and an exoskeleton made of chitin?

• A. Arthropoda
• B. Cnidaria
• C. Annelida
• D. Mollusca

Answer: (A)

Verified step by step guidance

1. Step 1: Begin by analyzing the key characteristics mentioned in the problem: segmented body, jointed appendages, and an exoskeleton made of chitin. These traits are unique to certain animal phyla.
2. Step 2: Recall the defining features of the phylum Arthropoda. Arthropods are known for their segmented bodies, jointed appendages, and a protective exoskeleton composed of chitin. This matches the description provided in the problem.
3. Step 3: Compare the traits of Arthropoda with the other phyla listed: Cnidaria, Annelida, and Mollusca. Cnidaria includes animals like jellyfish and corals, which lack segmentation, jointed appendages, and an exoskeleton. Annelida includes segmented worms, but they do not have jointed appendages or a chitinous exoskeleton. Mollusca includes animals like snails and clams, which have a shell but lack jointed appendages and segmentation.
4. Step 4: Based on the comparison, identify that Arthropoda is the only phylum that fits all the characteristics described in the problem.
5. Step 5: Conclude that the correct answer is Arthropoda, as it is the phylum characterized by a segmented body, jointed appendages, and an exoskeleton made of chitin.