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Worms make up the largest group of complex invertebrates.
insects
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Cnidarians are the most diverse group.
The largest group of invertebrates is the arthropods, including: the crustaceans (crabs etc) the arachnids (spiders etc) the insects the myriapods (centicipedes etc).
Yes insects can be said to form the largest group of invertebrates with about a million species described and possibly several millions yet to be described. Of these, about 400,000 are the coleoptera (beetles).
Gastropods is far wrong. The "group" or "class" of the Phylum Molluska with the largest and fastest species are the Cephalopods. Largest being the giant squid, Fastest prob a tie between squid and octopus.
I do not know if there is an exact percentage, but I do know that the of the known species, the most are invertebrates. This is because bugs are invertebrates. There are so many different species of bigs, just the insects alone, that we cannot find and name them all. Also you have many other groups of invertebrates.
INVERTEBRATES!!
Approximately 95% of living animals on Earth are invertebrates. So there are more invertebrates.
That depends on your definition of the word "successful." If you mean which group is more numerous and has populated more of the world, it would be the invertebrates. If you mean which has more higher intelligence, it would be vertebrates. If you mean which group is more essential to the food chain, it would be the invertebrates. If you mean which has the largest animals, it would be the vertebrates. It all depends on what you're talking about.
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