1. Introduction
  1.1 Background
  1.2 Objectives
2. Anatomy of the Digestive System in Marine Animals
  2.1 General overview of the digestive system
  2.2 Structural adaptations for marine life
  2.3 Comparison with terrestrial animals
3. Digestive Processes in Marine Animals
  3.1 Ingestion and feeding strategies
  3.2 Mechanical digestion
  3.3 Chemical digestion
  3.4 Absorption and assimilation of nutrients
4. Case Studies: Digestive Systems of Select Marine Species
  4.1 Sharks and rays
  4.2 Cetaceans (whales, dolphins, and porpoises)
  4.3 Sea turtles
  4.4 Seabirds
  4.5 Marine invertebrates (e.g., mollusks, crustaceans)
5. Adaptations for Digestion in Extreme Marine Environments
  5.1 Deep-sea organisms
  5.2 Hydrothermal vent organisms
  5.3 Polar marine organisms