Annelids have closed circulatory systems, meaning the blood moves through pressurized vessels. find the dorsal blood vessel and the ventral blood vessel. how does blood move from one to the other? blood is pumped by 5 vessels that encircle the esophagus—locate them. what structure in your body are these 5 pumping vessels analogous to? what are some evolutionary advantages of a closed circulatory system, over relying on diffusion through the body wall as in flatworms and nematodes?

in situ hybridization has been widely used for research applications, including clinical cytogenetics, gene mapping, tumor biology and studies of chromosome evolution.

lesson summarykaryotypes a genome is the full set of all the genetic information that an organism carries in its dna. chromosomes arebundles of dna and protein found in the nucleus of a eukaryotic cell.

they had the law tat factories that produces smoke cannot be built near residential buildings.

building of proper sewage system was done to ensure that the waste is carried away from the humans so that they do not get diseases from it.

also they built water systems to provide water in those areas which are drought prone.