Salary. The BLS puts the national estimate for billing clerks at a mean hourly wage of $16.31, or $33,920 annually, as of May 2011. The amount billing clerks earn also varies by industry, state and metropolitan area.nvoicing is done through the company's accounts receivables system. Until the bill is paid, it remains as a debit on the customerâs account. Once paid, the customerâs account is credited. If customers fail to pay their invoice, the billing clerk sends them reminders, and, in some cases, attempts to collect the debts.
There are thousands of different types of flatworms, most are not dangerous to humans. Flatworms belong to one of four subsidiary groups. Those found in streams, ponds, moist soils, and the sea are the turbellarians.They are free-living, that is they move about looking for food. The other three groups â the Tremotada (flukes), Cestoda (tapeworms), and Monogenea â are all parasitic.here are thousands of different types of flatworms, most are not dangerous to humans. Flatworms belong to one of four subsidiary groups. Those found in streams, ponds, moist soils, and the sea are the turbellarians.
Body Cavity. Flatworms are acoelomate, which means they do not have a body cavity. Roundworms are psuedocoelomate, which means they have a body cavity between their mesoderm and endoderm layers.he flatworm Planaria and the roundworm Caenorhabditis elegans are both lab organisms that are called worms. However, they are not closely related. Flatworms (phylum Platyhelminthes) and roundworms (phylum Nematoda) are both called worms, but there are many differences between these two types of organisms.