Which of the samples shown below are eukaryotic?

a) b and d

b) b and c

c) a, c, and d

d) a, b, and d

Why does bubbling occur when vinegar mixed with baking soda

Is a measure of the different types of organisms in a community. question options: tertiary secondary primary none of the above

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.