The grants data showed that natural selection takes place a) rarely b) never c) slowly d) frequently, and sometimes rapidly

Answer;

D) frequently, and sometimes rapidly

Explanation;The hypothesis that the Grants have been testing was about the natural selection shaping the beaks of different bird populations.The Grants documented that natural selection takes place in the wild finch population frequently, and sometimes rapidly. The Grants' work showed that variation within a species increases the likelihood of the species' adapting to and surviving environmental change.