Final answer:
The sentence 'The loss of wetland not only damages the environment but creates even more issues' should be added after sentence 11, providing a seamless transition into discussing further issues related to wetland loss without disrupting paragraph coherence.
Step-by-step explanation:
When structuring a paragraph, adding a detail such as 'The loss of wetland not only damages the environment but creates even more issues' is most effectively done where it will enhance the coherence and flow of the ideas presented. Sentence 9 mentions the impact of wetland loss on the biotic and abiotic parts of an ecosystem. Sentences 10 and 11 further explain the causes and some potential solutions. After sentence 11 seems to be a natural break where new information can be inserted, as it would follow the explanation of the problem with wetland loss and precede any further details or examples.
Therefore, the most suitable placement for the sentence 'The loss of wetland not only damages the environment but creates even more issues' would be Option C: After sentence 11, as it would provide a segue into discussing additional issues caused by the loss of wetlands without interrupting the flow between the specific details provided in sentences 9 to 11 and the new topic introduced after sentence 11.