-Fish: Fishes also known as Pisces belong to the phylum Chordata. This phylum is characterized by the closed type of blood circulatory system. Are annelids having closed circulatory system? Annelids are segmented worms such as earthworms and leeches. Annelids have a coelom, closed circulatory system, excretory system, and complete digestiveRead More →
A type of circulation in which blood flows through the heart twice is called double circulation. … The pulmonary trunk( right and left pulmonary artery) carries blood from the right ventricle to the lungs where the exchange of gases takes place. Do all animals have a double circulatory system? DoubleRead More →
Complete digestive tract: Comparable to that of annelids, but nematodes show little or no specialization of different regions of the gut. No circulatory system: Nematodes don’t have hearts, blood vessels, or blood. The fluid in the pseudocoel passively circulates nutrients and other substances throughout the body. Do roundworms have anRead More →