NEET BIOLOGY

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: -Some snakes have as many as 500 vertebrae. Animals without a backbone are called invertebrates. Most animals are invertebrates. In fact, 95% of all living creatures on Earth are invertebrates.

Detailed explanation-4: -An invertebrate is an animal without a backbone. In fact, invertebrates don’t have any any bones at all! Invertebrates that you may be familiar with include spiders, worms, snails, lobsters, crabs and insects like butterflies. However, humans and other animals with backbones are vertebrates.