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.
1 They have a circulatory system and a digestive system. 2  Flatworms, roundworms, and segmented worms are all invertebrates. 3  Some species of each type of worm are free-living, meaning they are not dependent on another organism for food. 4  Segmented worms are the most complex animals of these three invertebrates. Students will then continue with their Internet research to compare flatworms, roundworms, and segmented worms by completing the Worm Comparison worksheet. 2  They should use their research to find more information in order to describe how these three types of worms are similar and how they are different.