Create a 15-slide PowerPoint for M.Sc. Zoology students on solvents. Use only the solvents-related content from the uploaded e-book. Ignore all unrelated chapters and topics. Include definition, classification, sources, chemical properties, mechanism of toxicity, bioaccumulation, effects on humans and ecosystems, important case studies, diagrams, and a summary. Use simple language suitable for classroom teaching. Keep each slide concise, include relevant scientific images and labelled diagrams, and retain important facts and references. Export as an editable PPTX file.