Agalaxy holds a special place among all the other objects in outer space. which is the best description of a galaxy according to its relationship to other objects?

a)a galaxy is a grouping of millions or billion of star along with clouds of gas and dust
b)a galaxy is a new star that shines very brightly
c)a galaxy is a place that only existed in space long ago
d)a galaxy is the universe

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.