Which concept in organic chemistry is illustrated by the study of ecological succession following the eruptions of Mount St. Helens?

• A. The role of pioneer species in ecosystem recovery
• B. The effect of $\mathrm{temperature}$ on $\mathrm{reaction} \mathrm{rates}$
• C. The importance of $\mathrm{chemical} \mathrm{bonding}$ in volcanic ash
• D. The significance of $\mathrm{stereochemistry}$ in plant growth

Answer: (A)

Verified step by step guidance

1. Identify the main topic of the problem, which is the study of ecological succession following volcanic eruptions.
2. Understand that ecological succession involves the gradual process of change and development in an ecosystem over time.
3. Recognize that pioneer species are the first organisms to colonize a barren environment, such as the area affected by volcanic eruptions.
4. Connect the concept of pioneer species to their role in ecosystem recovery, as they help establish the initial conditions for other species to thrive.
5. Conclude that the concept illustrated by the study of ecological succession in this context is the role of pioneer species in ecosystem recovery.