Question

Difference between , vertebrate and invertebrate , insecta and arachnida , flatworm and roundworm .

Answer 1

vertebrates means who has bones and invertebrates means who don't have bones

Answer 2

Insects or Insecta are hexapod invertebrates and the largest group within the arthropod phylum. Definitions and circumscriptions vary; usually, insects comprise a class within the Arthropoda. As used here, the term Insecta is synonymous with Ectognatha.