GENERAL HISTOLOGY

Detailed explanation-1: -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-2: -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-3: -Unbeknownst to most people, invertebrate animals make up the vast majority of life on the planet and represent over 97% of all animal species known to science.

Detailed explanation-4: -Invertebrates make up over 95 percent of the Earth’s animal species.

Detailed explanation-5: -95% of animal species are invertebrates. 5 % of animal species are vertebrates. Flatworms, arthropods, sponges, insects are a few examples of Invertebrates. Mammals, fish, reptiles, amphibians, and birds are examples of Vertebrates.