The vena cava brings blood loaded with co2 to the ( that delivers the blood to the ( this chamber pumps the co2 loaded blood through the ( the where co2 is released and red blood cells take on ( blood then returns to the heart through the ( and enters the (g) . this chamber delivers blood into the ( that pumps it through the ( to all parts of the body. the walls of the ( much thicker than the walls of the ( this thick, muscular wall allows for effective circulation of blood through the (l) .

The vena cava brings blood loaded with CO2 to the right atrium, that delivers the blood to the right ventricle. This chamber pumps the co2 loaded blood through the pulmonary artery to the lungs where co2 is released and red blood cells take on oxygen. Blood then returns to the heart through the pulmonary vein and enters the left atrium. This chamber delivers blood into the left ventricle that pumps it through aorta to all parts of the body.

The walls of the left ventricle are much thicker than the walls of the right ventricle. This thick, muscular walls allows for effective circulation of blood through the cardiac circuit.

organisms that lack symmetry are called asymmetrical and belong to phylum porifera/sponges.

organisms with specialized stinging cells belong to phylum cnidaria. stinging cells are called cnidoblast cells.

cnidarians show two morphological forms : polyp (sessile) and medusa (mobile)

filter feeding is observed in porifera members.  

alternation of generation is observed in coelenterata or cnidaria. there is alternation of asexual polyp form and sexual medusoid form. it is also referred as metagenesis.

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