A scientist is designing an investigation to study which color of peppered moth would have a higher survival rate in his neighbo
rhood. What is most likely the test variable (independent variable) in this investigation? A Neighborhood environment
B Survival rate
C Number of predators
D Colors of peppered moths
In an experimental set up, an independent variable can be changed either by it's own or manually. This change can be observed over the dependent variable. The changes in the dependent variable can be observed so as to determine the outcome of the experiment.
The independent variable is the test variable of the experiment and the dependent variable is the experimental variable.
According to the condition, the color of the peppered moths is the independent variable, as it's affect is to be determined over the survival rate of the peppered moths which is the result of the experiment. The color may vary among the peppered moths.
The stratospheric ozone layer absorbs ultraviolet (UV) radiation, preventing dangerous UV rays from hitting Earth's surface and harming living organisms. UV rays cannot be seen or felt, but they are very powerful and change the chemical structure of molecules.
The carbon dioxide is one of the green house gases and mainly responsible for the increase of the earth's temperature. The plants uses the carbon dioxide for the photosynthesis process.
The plants that are exposed to the normal carbon dioxide can be used as a control in this experiment. Then the scientists will notice that if the amount of carbon dioxide is increased, does it show any positive or negative effects in the experiment.
