In a study published in the journal Environmental Science and Technology in 2001

ID: 141351 • Letter: I

Question

In a study published in the journal Environmental Science and Technology in 2001, scientists were testing the endocrine disruptor hypothesis, which states that certain chemicals can interfere with hormone regulation in many organisms, leading to disorders such as the feminization of males. The scientists used juvenile fish and exposed them to either tap water or varying concentrations of treated sewage effluent (containing an array of chemicals). For this experiment, identify the control group, the treatment group, as well as the independent and dependent variables. Drag each item on the left to its matching item on the right. dependent variable" independent variable" treatment control juvenile fish exposed to tap water concentration of treated sewage effluent percentage of fish with female-like reproductive ducts juvenile fish exposed to sewage-treatment effluent

Explanation / Answer

Juvenile fish exposed to tap water

Control

Concentration of treated sewage effluent

Independent variable

Percentage of fish with female-like reproduct duct

Dependent variable

Juvenile fish exposed to sewage treatment effluent

Treatment

In the scientific observation, dependent variable is the variable being tested and measured while the variable that is changed or controlled to test the effects on the dependent variable is independent variable. The control is factor that is designed to minimize the effects of variables or normalize the effect of the treatment with the untreated observation.