A student observes two invertebrates–one has a muscular foot, while the other has a chitinous exoskeleton. To which phyla do these organisms belong?
Mollusca and Arthropoda
A muscular foot used for movement is a characteristic feature of molluscs, such as snails and slugs. So the first invertebrate belongs to phylum Mollusca.
A hard exoskeleton made of chitin, along with jointed legs, is the characteristic feature of arthropods such as insects, spiders and crabs. So the second invertebrate belongs to phylum Arthropoda.
Annelids such as earthworms have soft, segmented bodies with no chitinous exoskeleton and no muscular foot, and echinoderms such as starfish have a spiny skin with tube feet and a calcareous (not chitinous) skeleton.
Hence, Mollusca and Arthropoda.
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