Question

refer to the table containing features found across the large group of animals classified as protostomes. some of these are present in all protostomes; some are present in certain subsets of this group.

match each feature with the advantage gained by a protostome expressing that feature.

Explanation:

• A. Jointed appendages: These allow for complex patterns of movement. For example, in arthropods (a group of protostomes), jointed appendages enable activities like walking, flying (in some), and grasping.
• B. Thick cuticle containing chitin: Chitin - rich cuticle provides protection from desiccation (drying out). It acts as a barrier, reducing water loss from the body.
• C. Anterior brain: The anterior brain is involved in sensing and processing of the environment. It can receive sensory inputs (e.g., from eyes, antennae) and coordinate appropriate responses.
• D. Lophophore: A lophophore is a specialized structure (found in some protostomes like brachiopods and bryozoans) that is used for rapid gas exchange in aquatic habitats. It has a large surface area with ciliated tentacles that facilitate the uptake of oxygen and release of carbon dioxide.
• E. Mesoderm: The mesoderm provides the potential for muscle development. Muscle tissues (e.g., in annelids - a protostome group) develop from the mesodermal layer.

Answer:

A = 4, B = 5, C = 2, D = 1, E = 3