A student drops some metal paper clips in a box of sand. The student uses a magnet to separate the metal paper clips from the sand. The reason this works is that the sand and paper clips together are . A) a mixture B) an element C) a compound D) a substance

Why reason best illustrates why hershey and chase chose to use viruses in their experiment?

Which of the following statements is accurate about evolution? question 10 options: natural selection only eliminates odd individuals. evolution means that a population never has changes in its genetic frequencies. mutations are always harmful. evolution means that a population undergoes changes in its gene frequencies over time.

Many organizations release indexes used to measure the development of the world's countries. as we learned in this lesson, these indexes measure many factors, from life expectancy to happiness. in your opinion, what are the three most important factors we can use to determine how developed a country might be? explain your answers in a few sentences.