At which level is it presumed we have the least scientific understanding? (10, 7)
Change in genetic composition between generations (14)
In cladistic taxonomy, organisms are classified on the basis of (9)
Snails with brown shells are more common in woodlands where the ground surface is darker; against this background snails with yellow shells are very visible and are more likely to be eaten by predatory birds. This is an example of: (7, 9)
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