Pls answer this question 2 this question has two right options

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

How do diseases caused by bacteria and diseases caused by viruses react to antibiotics?

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.