The following curve shows the distribution of the masses of the individuals in
a population of gerbils.
Number of gerbile
Mass (grams)
Which of the curves below shows the same population after directional
selection has happened?

The graph D is the correct option.

Explanation:

In ecological studies, directional selection can be described as the event in which a single phenotype is favoured through the process of natural selection. Due to this, the allele frequency of the population shifts towards the particular extreme phenotype with time.

The Graph D shows how the population of gerbile was before and how directional selection favoured a single phenotype and caused it to become abundant.

carbon atoms, hydrogen, oxygen, and nitrogen.