The answer is A (the sun)
The first line of defense in plants is an intact and impenetrable barrier composed of bark and a waxy cuticle. Both protect plants against herbivores. Other adaptations against herbivores include hard shells, thorns (modified branches), and spines (modified leaves).
The correct description of structure and function is the small intestines; absorbs fats and fatty acids. The cardiac sphincter prevents the acidic contents of the stomach from moving upward into the esophagus. The stomach is where digestion takes place, both mechanical and chemical digestion
