Question

Choose the correct answers from the alternatives given.
Of the following groups of organisms, which is the most evolutionarily advanced, with more complex body structure?

• A. Roundworms
• B. Cnidaria
• C. Sponges
• D. Flatworms

Answer 1

The correct option is A Roundworms

The nematodes or roundworms constitute the phylum Nematoda (also called Nemathelminthes). have a slightly more complex body plan. are the most complex animals with worm-like body plans. A study of worms illuminates a possible history of some organ systems and body features evolved. Cnidarians, Porifera and flatworms are of lower phylum, development and less complex.

So, the correct option is, 'Roundworms'.