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[Audio] Snail Tissue usually composed of two or more layers; nerve cells and muscle cells usually present; sessile or motile; nutrition generally by ingestion; multicellular. So Kingdom is Animalia Shape is round or thick and may be enclosed in a shell Body shows some radial or bilateral symmetry surface is not porous or spongy. Symmetry is usually bilateral segmentation is not obvious. Shape is round or thick, and may be enclosed in a shell. Body consists of muscular foot, visceral mass and mental ,external shell may be present, foot may be divided into eight tentacles. So it's phylum is Mollusca. Body has one shell or no shell So its class Gastropoda..

[Audio] Earthworm Keys Tissue usually composed of two or more layers; nerve cells and muscle cells usually present; sessile or motile; nutrition generally by ingestion; multicellular. So Kingdom is Animalia Body shows some radial or bilateral symmetry; surface is not porous or spongy. Symmetry is usually bilateral Segmentation is apparent or if not apparent there are appendages and/or obvious eyes or slime glands, adult may be satellite with two openings inhalant or exhalant siphons). Support by hard skeleton (internal or external) or adult may be sac-like with two openings (inhalant and exhalent siphons). Support by hydrostatic skeleton, soft body with numerous similar segments. So it's phylum is Annelida..