High-fat foods stimulate the appetite mostly because they ​

Out of the following given choices;

a.       are satiating b. are flavorful c. suppress salivary gland secretion d. trigger the release of oxyntomodulin e. increase secretion of endorphins.

The answer is B. The chemical structure of fats greatly dissolve and concentrate food odor hence induce more the odor and taste chemoreceptors. Fats also enable well the distribution of salts and seasoning in food.  This makes food high in fats smell and tastes well. This causes an increase of appetite.

links? do you have a link? i don't see anything?

i believe it's c. the trait for large beaks will be passed on to future generations through natural selection.

since eventually smaller beaks would have to find another source of food or even eventually just die out from the lack of food.