Question

what is the most likely source of endocrine disruptors in aquatic ecosystems? human medicines that pass through sewage plants natural aquatic plants

Explanation:

Endocrine disruptors in aquatic ecosystems often come from human activities. Human medicines containing endocrine - active compounds can enter sewage systems. Sewage treatment plants may not fully remove these compounds, and they then get discharged into aquatic ecosystems. Natural aquatic plants do not typically produce endocrine disruptors that would be a major source in this context.

Answer:

human medicines that pass through sewage plants