Question

1. problem: is pollution from boats causing the frog deformities seen in your local pond or is it sewage water? experiment: gather eggs that have been exposed to three different scenarios: a sample of pond water with local pollutants added, a sample of pond water with sewage, and a sample of pond water that has been cleaned of all known contaminants.

part of experiment|answer
---|---
independent variable|
dependent variable|
constants|
experimental groups|
control group|

Explanation:

Step1: Identify independent variable

The type of water - based pollutant (local pollutants, sewage, clean water) is what is being changed, so it's the independent variable.

Step2: Identify dependent variable

The occurrence of frog deformities is what is being measured and is affected by the independent variable.

Step3: Identify constants

The frog eggs, the environment where the eggs are placed (other than the water type), and the time of exposure can be considered constants.

Step4: Identify experimental groups

The groups with frog eggs exposed to local pollutants - added pond water and sewage - added pond water are the experimental groups.

Step5: Identify control group

The group with frog eggs in clean pond water is the control group.

Answer:

Independent Variable: Type of water - based pollutant (local pollutants, sewage, clean water)
Dependent Variable: Occurrence of frog deformities
Constants: Frog eggs, environment (other than water type), time of exposure
Experimental Groups: Frog eggs in pond water with local pollutants, frog eggs in pond water with sewage
Control Group: Frog eggs in clean pond water