SOCIAL RELEVANT ISSUE Background Insects are by far the largest group of hexapod invertebrates within the arthropod phylum. They play a very important role in the environment and can be found anywhere in the world. They have a chitinous exoskeleton, a three-part body composed of a head, thorax, and abdomen. They also have three pairs of …

General Arthropod Characteristics • Coelomate, Triploblastic • Protostome (Ecdysoan) • Cephalization • Open circulatory system • Tagmatization • Exoskeleton made of Chitin • Jointed appendages • Molting (ecdysis) • Live in almost all habitats on the earth • Estimates of 30-100 million species! (mostly insects) …

Social Relevant Issue Background “Earthworms are found in the class Oligochaeta, phylum Annelida and are a tube-shaped, segmented worm. They are commonly found living in soil and feed on dead organic matter. Their digestive system runs through the length of their body and they conduct respiration through their skin……..” Click here …

+General Annelid Characteristics  Coelomate, Triploblastic Protostome (lophotrochozoan) Cephalization Bodies are segmented, worm-shaped Setae (chaetae) Closed circulatory system Metanephridia Complete digestive system Marine, freshwater, terrestrial +Class Polychaeta (nearly all marine) + Parapodia function in locomotion and gas exchange, are highly vascularized and increase the surface area of …

Social Relevant Issue Background Schistosomiasis is in the phylum Platyhelminthes and class Trematoda. It is a parasitic flatworm responsible for serious infections in humans. It parasitizes blood capillaries of either the mesenteries or plexus of the bladder, depending on the infecting species. Schistosomiasis is a …