A wastewater manager is concerned about the increasing number of intestinal illnesses in his town and the corresponding increased levels of a pathogen known to cause this illness found in wastewater samples. Which process should be used to track the source of this waterborne illness in his town? - Epidemiology
- Civil engineering
- Hydrologic tracing
- Water management

Which of the following best describes the purpose of the parathyroid hormone? a. it decreases the blood calcium level and decreases blood phosphorus level. b. it decreases the blood calcium level and increases the blood phosphorus level. c. it increases the blood calcium level and increases blood phosphorus level. d. it increases the blood calcium level and decreases blood phosphorus level.

How many copies of genes do gametes have?

Can ground tissue do photosynthesis