Explain, in detail the process of anaerobic digestion with a neat sketch.

Anaerobic digestion is a biological process in which microorganisms break down organic matter in the absence of oxygen to produce biogas and digestate. This process is widely used for managing organic waste, wastewater treatment, and renewable energy production. The primary end products of anaerobic digestion are methane (CH₄), carbon dioxide (CO₂), and a nutrient-rich sludge that can be used as a biofertilizer.  

### Stages of Anaerobic Digestion  
The process of anaerobic digestion occurs in four main stages:  

1. Hydrolysis  
   - In this stage, complex organic matter such as carbohydrates, proteins, and fats are broken down into simpler soluble compounds.  
   - Enzymes secreted by microorganisms help in breaking down large molecules into smaller molecules such as sugars, amino acids, ________ ______ ______ _________ __________ __________ _________ ____ ________ ______ _____ ____.
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