The two main variables in an experiment are the independent and dependent variable.
An independent variable is the variable that is changed or controlled in a scientific experiment to test the effects on the dependent variable.
A dependent variable is the variable being tested and measured in a scientific experiment.
The dependent variable is 'dependent' on the independent variable. As the experimenter changes the independent variable, the effect on the dependent variable is observed and recorded.
For example, a scientist wants to see if the brightness of light has any effect on a moth being attracted to the light. The brightness of the light is controlled by the scientist. This would be the independent variable. How the moth reacts to the different light levels (distance to light source) would be the dependent variable.
When results are plotted in graphs, the convention is to use the independent variable as the x-axis and the dependent variable as the y-axis.
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you should have skills of drawing observe the diagram
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The terms old world and the new world are used in the context of history and for the prime objective of differentiating the major ecozones found on the planet. This also helps in categorizing various species of plants and animals that originated in different places and times.
In terms of old and new, Old World signifies to Asia, Europe, and Africa, on the other hand, the New World signifies towards the Americas that comprise South America, North America, and Central America. The New World monkeys possess prehensile tails, while the Old World monkeys don't. This suggests that the prehensile tail originated in the monkeys found in the New World, primarily after the separation of the Americas from Asia and Africa.