LIFE SCIENCE

Detailed explanation-1: -Sponges, corals, worms, insects, spiders and crabs are all sub-groups of the invertebrate group-they do not have a backbone. Fish, reptiles, birds, amphibians and mammals are different sub-groups of vertebrates-they all have internal skeletons and backbones.

Detailed explanation-2: -Answer: The bone present on the extreme back of our body is known as backbone. It is also known as the vertebral column or spine.

Detailed explanation-3: -Vertebrates are animals that have a backbone or spinal column, also called vertebrae. Several groups of vertebrates inhabit planet Earth. The five most well known classes of vertebrates (animals with backbones) are mammals, birds, fish, reptiles, amphibians.

Detailed explanation-4: -More than 98% of Earth’s animals are invertebrates. Invertebrates do not have backbones or internal skeletons, but some have hard coverings. Insects, spiders, worms, snails, and most ocean animals are invertebrates.