9. Which of the following options correctly identifies three evolutionary adaptations that enable some animals to directly exchange matter (such as gases, nutrients, and wastes) between their body cells and the environment? (A) A gastrovascular cavity, a body with only two cell layers, and a flat body shape. (B) An external respiratory surface, a small body size, and a complex circulatory system. (C) A large body volume, a long tubular body, and a thick protective cuticle. (D) An unbranched internal surface, a microscopic body size, and a thick skin. (E) A high surface area-to-volume ratio, a flattened body shape, and a branched internal digestive tract.