AP BIOLOGY

Detailed explanation-1: -To group all invertebrates together is an immodest proposal, since the definition of “invertebrate” is any animal without a spinal column-no less than 97 percent of all animal species on Earth.

Detailed explanation-2: -The vast majority of animal species (95 percent) are invertebrates. Among all animal species, one particular group easily claims the highest number of species: the insects. Insects-a group within the phylum Arthropoda-have evolved into several millions of species, particularly beetle insects (order Coleoptera).

Detailed explanation-3: -This is by far the largest group in the animal kingdom: 97 percent of all animals are invertebrates. So far, 1.25 million species have been described, most of which are insects, and there are millions more to be discovered.

Detailed explanation-4: -Invertebrates make up over 95 percent of the Earth’s animal species. For many years, invertebrates have been kept as pets, displayed in aquariums and zoos, used for research, and consumed.