The amount of pollution produced by cars was measured for cars using gasoline containing different amounts of lead. One car was
used to test the four types of fuel: 10% lead gasoline, 15% lead gasoline, 20% lead gasoline, unleaded gasoline. In between the use of each the car's gas tank was emptied. The exhaust of the car was collected and analyzed.What is the independent variable?
The independent variable in an experiment is the variable that is being changed in a scientific experiment. It is the cause of any of the observed outcomes of the experiment. The Independent variables is the variable that the experimenter changes to analyse its effect on the dependent variable(outcome).
In this case, the type of fuel (independent variable) is being changed and its effect on the amount of pollution (dependent variable) is observed.
<span>The answer is 4 . The population will begin to decrease to depletion of resources and increased competition. This will cause an increase in death rate of the paramecium population as compared to birth rate. This phase follows the latent phase where the population remains the same over time as the population reaches carrying capacity and the birth rate equals death rate</span>
