ACCORDING to evolution.Porifera ⇒ Coelenterata ⇒ Ctenophora ⇒ Platyhelminthes ⇒ Aschelminthes ⇒ Annelida ⇒ Arthropoda ⇒ Mollusca ⇒ Echinodermata ⇒ Hemichordata ⇒ Chordata.There is evidence that all organisms evolved from a common ancestor. For example- Connecting linksExplanation -Organisms with RELATED properties have been placed in the same PhylumThere are animals that have properties of two classes are called connecting links.Peripatus shows the characters of both phylum Annelida and Arthropoda.Peripatus have jointed paired legs, COMPOUND eyes, and TRACHEAE like other arthropods. Annelidan characteristics, such as worm-like segmented body, non-chitinous cuticle, and segmental nephridia.Thereby peripatus is a connecting link between Annelida and Arthropoda.Animals nameConnecting linksPlatypusReptilia and MammaliaEchidnaReptilia and MammaliaVirusLiving and Non-livingEuglenaPlants and AnimalsArchaeopteryxReptiles and BirdsChimeraCartilaginous fish and Bony fishDarwin gave the THEORY of natural selection for organic evolution.Hugo de Vries gave the theory of mutation.Lamarck gave the theory of acquired characters.