All the animals present on earth are either Invertebrates or Vertebrates. Invertebrates make up the larger proportion i.e. approx 98% of the total animal kingdom whereas vertebrates are only 2%. The invertebrates are organisms with simple structures and uncomplicated living mechanisms. They are known as invertebrates as they lack the vertebral column or vertebrae to support their body. Invertebrates lack a proper endoskeleton and also a developed nervous system. Contrarily the vertebrates … [Read more...]