Tại sao phải tiếp kiệm thời gian trong tiếp khach ở cơ quan, doanh nghiệp? Đề suất biện pháp tiếp kiệm thời gian ở cơ quan, doanh nghiệp?

The authors use the word “backbone” in lines 3 and 39 to indicate that

What is the binomial name of the horsefly species that's golden backside inspired a 24-year old researcher to name it after a pop star in january 2012?

You want to test the hypothesis that smoking cigarettes increases the risk of lung cancer. in your experiment, you take 100 people of various ages and genders for each of your groups. one group smokes. the other group does not smoke. the group that does not smoke is called the group