Which graph most likely shows an ecosystem that has undergone a primary succession event during the observation period

Graphs attached

Graph D

Explanation:

Primary succession is when a population arises from an environment that was previously entirely devoid of any living things.

Therefore, the number of living things would start at 0. Once a pioneer species colonizes the area, it makes the soil more fertile. This makes it a more suitable environment for other species to grow. Over time, the number of species increases as the community becomes more complex, until it reaches its peak and plateaus at its final composition, which is called the climax community.

This is represented by Graph D

a, i am pretty sure.

the missing space is phylum