Answer:
The sound of thunder up above, crashing repeatedly, makes the natural landscape beautiful.
Explanation:
The research error described above is an example of selection bias.
Selection bias takes place when, from a population of interest, a group of individuals is selected in order to construct a sample but without a proper randomization. The result is a sample which is not representative of the underlying population.
According to the example, the target population of the research comprises all students but the sample only includes boys. Hence, selection has not been random because it followed a gender criteria, and the results obtained using it cannot be applicable to the whole population because they are affected by a selection bias.
The answer to go in the blank would be B) Scarce or the second option.
Answer:C) Natural selection
Explanation:
C) Natural selection is the process under which species with resistant traits are able to survive better and adapt to different environmental pressures , climate changes and competition for resources or food and are able to reproduce as many as possible of the same species with similar traits , as a result of this these traits are carried from generation to generation.
