Groups of organs in the body work together as organ systems. Each organ system has a special role in the body. Organ systems include the nervous system, immune system, and endocrine system. What is the role of the endocrine system in the body? Required to answer. Single choice. (10 Points)

It gets rid of wastes that the body produces.

It uses electrical signals to control body

It uses chemical messages to control body

It gets rid of bacteria and viruses that invade the body.

The minerals found in bones are deposited by living cells called

The organism shown is a free-living one that is anchored to the bottom of ponds and streams during one stage of its life cycle what is the common name for the group to which this organism belong

Tooth enamel consists mainly of the mineral calcium hydroxyapatite, ca_10(po_4)_6(oh)_2. trace elements in teeth of archaeological specimens provide anthropologist with clues about diet and diseases of ancient people. students at hamline university measured strontium in enamel from extracted wisdom teeth by atomic absorption spectroscopy. solutions with a constant total volume of 10.0 ml contained 0.726 mg of dissolved tooth enamel plus variable concentrations of added sr. added sr find the concentration of sr in the 10 ml sample solution in parts per billion = ng/ml. find the concentration of sr in tooth enamel in parts per million = mu g/g.