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Q.
Most advanced invertebrates are
Animal Kingdom
Solution:
Cephalopods such as Octopus, cuttlefish and squid (coleoids) are the most advanced invertebrates among the given options. They belong to class-Cephalopoda of phylum-Mollusca.
These organisms have a prominent head and a set arms or tentacles. They are widely regarded as the most intelligent of invertebrates and have well-developed senses and larger brains. Their nervous system is the most complex of all invertebrates.