A variable refers to anything, which is being modified within an experiment. A dependent variable refers to the variable whose value relies on the independent variable. The independent variable refers to the variable, which is being manipulated by the experimenter.
In the given experiment, the student is experimenting that how the height from which the ball is dropped influences the bounce of the ball. The height at which the ball bounces is the variable that is being determined and relies upon the height from which the ball is dropped, that is, the independent variable.
Hence, the control variable would be the ball used.
Industrial melanism<span> is the resultant effect of</span><span> </span>industrial pollution on arthropods<span>. The individuals that had a darker pigmentation were more fit to the new environment, more polluted that caused darkened buildings and trees, and were thus favoured by </span>natural selection to survive.
Insecticide resistance and antibiotic resistance is also a manifestation of the emergence of new groups of organisms that are resistant to a specific attack out of an existing population, and are therefore favoured by selection to survive over the others.
The attraction that holds two covalently bonded atoms together is called covalent bond
They both eat zooplankton I think
