Flowers whose throats (nectaries) are too long for potential pollinators to reach their nectar are unlikely to be pollinated and therefore unlikely to reproduce. But if the nectarines are too short, animals can get their nectar without pollinating them.This is an example of what sort of selection?

MCQs on how organisms evolve over time, with particular emphasis on natural selection, evolution, speciation, phylogeny and taxonomy, and aspects of genetics and inheritance. As well as the study of population ecology and ecosystems.