Describe how quasars got their name

What volume of a 0.25 m solution can be made using 0.55 moles of ca(oh)2

What is the approximate time of death of the body temperature is 29.4 degrees celsius

Which of the following statements is true about the relationship between genetic variation and natural selection? a. genetic variation must be present in a population before natural selection can act on it. b. genetic variation arises in a population as a result of natural selection. c. natural selection can act on a population whether there is genetic variation within the population or not. d. after natural selection acts on a population, the amount of genetic variation in the population always increases.