Platyhelminthes-beings-morphology-kind of symmetry

Question

How are platyhelminthes characterized according to illustrations of representing beings, fundamental morphology, kind of symmetry, germ layers and coelom, excretory system, respiratory system, digestive system, circulatory system, nervous system and kinds of reproduction?

Answer 1

Illustrations of representing beings: schistosomes, planarias, taenias. Fundamental morphology: flat worm. Kind of symmetry: bilateral. Germ layers and coelom: acoelomates and triploblastics. Digestive system: not complete. Respiratory system: non-existent, respiration through diffusion. Circulatory system: non-existent. Excretory system: protonephridia by flame cells. Nervous system: ganglial, starting of cephalization. Kinds of reproduction: sexual and asexual.