Agroup of students are walking through the park and one of them takes a picture of a pollen grain that is being blown by the wind. what caption can the student use for the picture

The possible answers are :
a. gene mutation in action
b. gene flow at work
c. genetic drift as it happens
d. natural selection in progress

The correct answer is B.

When the wind is blowing a pollen grain away from the three, it's actively helping the gene flow between different individuals and populations of that plant. Gene flow helps to increase the variability in the populations. 

Rna polymeras should attache to the promoter.