There are animal groups that have smaller individuals than arthropods and they have a few hundred or a few thousand species.And there are animal groups that contain much larger organisms,and they have a few hundred or a few thousand species.Why do the intermediate-sized arthropods have over a million species?

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The Answer of There are animal groups that have smaller individuals than arthropods and they have a few hundred or a few thousand species.And there are animal groups that contain much larger organisms,and they have a few hundred or a few thousand species.Why do the intermediate-sized arthropods have over a million species?

There Are Animal Groups That Have Smaller Individuals Than Arthropods