It is answer A, the hippo is not benefitting from the catfish, therefore it is not mutualism.
Anticipating that one is about to eat can trigger the cephalic phase of digestion.
The cephalic phase of digestion is the stage during which the stomach responds to the mere sight, smell, taste as well as thought of food. Approximately 20% of total acid secretion takes place before food reaches the stomach.
During this phase of digestion, gastric acid and pepsinogen secretion is activated by the thought, sight or smell of food and also when food is inside the mouth.
The cephalic phase of gastric secretion is moderated completely through the parasympathetic nervous system. A variety of sensory stimuli including the sight, smell, and taste of food induces acid secretion in the stomach.
To learn more about parasympathetic nervous system here
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Food mostly becomes unsafe because of those who are responsible of handling or the ones who are doing the food. They would most likely handle food without even considering proper hygiene or how they cook the food in a way that could make them unsafe and unhealthy for the individuals to eat. People who handles them are mostly the ones who are responsible.
Industrial Age!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!