A multicellular organism that has an exoskeleton and jointed legs belongs to which of the following groups?

Rationale

Arthropods are multicellular organisms that have an exoskeleton and jointed legs.

Arthropods, which include insects, arachnids, and crustaceans, are characterized by their segmented bodies, exoskeletons made of chitin, and jointed appendages, making them well-suited for diverse environments.

A (Mollusks) YOUR ANSWER

Mollusks, such as snails and clams, do not possess an exoskeleton. Instead, they typically have a soft body and may have a hard shell made of calcium carbonate. They lack jointed legs; rather, they exhibit various forms of locomotion, such as using a muscular foot for movement.

B (Sea stars) YOUR ANSWER

Sea stars belong to the echinodermata phylum and are characterized by their radial symmetry and lack of an exoskeleton. They possess a unique water vascular system and tube feet for movement, which are entirely different from the jointed legs found in arthropods.

C (Arthropods) CORRECT

Arthropods are defined by their segmented bodies, exoskeletons, and jointed legs, making them the only group among the options that fits the description of having an exoskeleton and jointed appendages. This structural design allows for greater mobility and adaptability in various environments.

D (Mammals) YOUR ANSWER

Mammals are warm-blooded vertebrates with fur or hair and mammary glands. They do not have exoskeletons or jointed legs; instead, they possess an endoskeleton made of bone and various limb structures adapted for different modes of locomotion, such as walking or flying.

Conclusion

The defining characteristics of arthropods—namely their exoskeleton and jointed legs—distinguish them from mollusks, sea stars, and mammals, which lack these features. Understanding the unique traits of arthropods is crucial in studying biodiversity and ecological roles within different habitats.

A multicellular organism that has an exoskeleton and jointed legs belongs to which of the following groups?

Arthropods are multicellular organisms that have an exoskeleton and jointed legs.

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