A brief survey of plant and animal kingdom to pinpoint similarities and diversities in nature

 Classification on Animals Animals are divided into different Groups by their Physical  characteristics . Vertebrates: A  vertebrate  is an animal with a spinal cord surrounded by cartilage or bone. The word comes from vertebrae, the bones that make up the spine. Animals that are not  vertebrates  are called invertebrates.  Vertebrates  include birds, fish, amphibians, reptiles, and mammals. Invertebrates: An  invertebrate  is a cold-blooded animal with no backbone.  Invertebrates  can live on land—like insects, spiders, and worms—or in water. Marine  invertebrates  include crustaceans (such as crabs and lobsters), mollusks (such as squids and clams), and Cora.