Annelids are organisms which are invertebrates and are worms. Examples
Include earthworm, rag worm and leeches.
They don’t have a gastrovascular cavity. They don’t have an open circulatory system, instead it operates on a closed circulatory system.They lack pseudocoeloms which is the space between the endoderm and mesoderm. They however exchange gases through their moist skin.
The movement of the replication fork is accomplished by the enzyme helicase, which breaks hydrogen bonds between the paired bases and unwinds the double helix ahead of the advancing DNA polymerase.
