Phylum Mollusca

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<p>Shell secretion and housing the gills (C)</p> Signup and view all the answers

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A type of cell division in which the cleavage furrows form obliquely to the animal-vegetal axis, resulting in a spiral arrangement of cells.

A type of development where the fate of each embryonic cell is determined early on, meaning cells are committed to becoming specific tissues.

Molluscs primarily inhabit marine environments, ranging from shallow coastal waters to deep sea trenches.

A process where the coelom (body cavity) forms by splitting of mesodermal tissue.

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A fold of tissue that encloses the visceral mass (internal organs) and secretes the shell in molluscs. The mantle also houses the gills.

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Molluscs exhibit spiral cleavage during their embryonic development, a characteristic distinct from other animal phyla.
Most molluscs inhabit marine environments, although some species can be found in freshwater and terrestrial ecosystems.
Molluscs undergo protostome coelom development, where the mouth forms from the blastopore during embryogenesis.

The mantle is a significant anatomical structure in molluscs; it plays a crucial role in secreting the shell, protecting the soft body, and facilitating respiration and excretion.
Humans utilize molluscs in various ways such as food sources, in the production of jewelry (like pearls), and in scientific research, showcasing their economic and ecological importance.