The concept of keystone species is controversial among ecologists because most organisms are highly interdependent. if each of the trophic levels is dependant on all others how can we say one is most important
Pl as time goes by and water goes through the water cycle again and again, the amount of water on earth: increases decreases ostays the same goes up and down
Three applications for admission to a local university are checked, and it is determined whether each applicant is male or female. the number of sample points in this experiment is
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