NEET BIOLOGY

Detailed explanation-1: -One of the most well-known and primary methods of classifying animals is based on the presence or absence of the backbone. And there are two classifications that fall under it, namely vertebrates and invertebrates.

Detailed explanation-2: -Animals without a backbone are called invertebrates. Most animals are invertebrates. In fact, 95% of all living creatures on Earth are invertebrates. make up a large part of this group.

Detailed explanation-3: -Vertebrates and Invertebrates Animals can be classified as either vertebrates or invertebrates. Invertebrates are animals that don’t have a backbone. Some have soft bodies, like worms, slugs and jellyfish. Other invertebrates, like insects, spiders and crustaceans, have a hard outer casing called an exoskeleton.

Detailed explanation-4: -The 5 groups of vertebrates (animals that have a backbone) are fish, amphibians, reptiles, birds, and mammals. Invertebrates are animals that do not have a backbone. A spider is an invertebrate because it is an animal without a backbone. Spiders are classified as arachnids (not insects).

Detailed explanation-5: -Invertebrates are animals without a backbone. Vertebrates have an internal skeleton (endoskeleton) made of bones. Most but not all invertebrates have a hard outer casing called an exoskeleton.