Which of the following combinations of phylum and...

Which of the following combinations of phylum and description is incorrect?
a. Echinodermata-bilateral symmetry as a larva, coelomate
b. Nematoda-roundworms, pseudocoelomate
c. Platyhelminthes- -flatworms, gastrovascular cavity, acoelomate
d. Porifera-gastrovascular cavity, coelomate

Key Concepts

Animal Taxonomy

Animal taxonomy is the systematic classification of animals into hierarchical groups such as phyla, classes, orders, families, genera, and species. It involves categorizing animals based on shared characteristics, including anatomical structures, developmental patterns, and genetic similarities.

Body Symmetry

Body symmetry refers to the balanced distribution of duplicate body parts or shapes around a central axis. Bilateral symmetry, where the body can be divided into mirror-image halves, is common among many animal phyla during certain developmental stages, while radial symmetry is present in others. This concept is important for understanding the developmental and functional adaptations in various animal groups.

Body Cavities (Coelom, Pseudocoelom, Acoelomate)

Body cavities are fluid-filled spaces within animals that develop during embryogenesis. A true coelom is a completely lined, body-wide cavity that allows for the development of complex organ systems. Pseudocoelomates have a body cavity that is not entirely lined with mesoderm, while acoelomates lack a body cavity altogether. These distinctions are crucial for classifying animal phyla and understanding their physiological and evolutionary differences.

Digestive Systems and Gastrovascular Cavity

The digestive system in animals can either be complete, with separate openings for ingestion and excretion, or incomplete, with a single opening serving both functions. A gastrovascular cavity is an example of an incomplete digestive system that serves both for digestion and nutrient distribution. Its presence or absence helps differentiate between various animal groups and their respective feeding strategies.

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