Clams are Invertebrates because they have no spine.
Related Information:
Clams belong to the phylum: mollusca, along with snails, squid, octopi, and slugs. They belong to the class: bivalvia. They have a 2-piece closeable shell that protects them.
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Clams are filter feeders that feed on plankton in the water. Plankton can be plants or animals, so a clam should be an omnivore.