Question

multiple choice question
what characteristic do nematodes and arthropods have in common?
o ciliated lophophore
o molting of cuticle
o closed circulatory system
o coelom

Explanation:

Nematodes (roundworms) and arthropods (e.g., insects, crustaceans) are both part of the Ecdysozoa clade. A key characteristic of this clade is that its members have a cuticle (a non - living, protective outer layer) that they molt (shed) as they grow. This process is called ecdysis.

• Ciliated lophophore: This is a characteristic of lophotrochozoans (e.g., brachiopods, bryozoans), not nematodes or arthropods.
• Closed circulatory system: Nematodes have no circulatory system (gas exchange is through the body wall), and arthropods have an open circulatory system.
• Coelom: Nematodes are pseudocoelomates (they have a body cavity that is not fully lined by mesoderm), while arthropods are coelomates. But this is not the common characteristic.

Answer:

molting of cuticle