Identify the phylum of animals by the given characteristics and give an example of each.
(i) The coelomic cavity is blood-filled and the animals have jointed legs.
(ii) The animals are called the flatworms and are either free-living or parasitic.
(i) Arthropoda, e.g. spider, scorpion.
(ii) Platyhelminthes, e.g. Planaria, liver fluke.