You and a group of friends are spending your vacation hiking through the mountains. it is cold in the mountains. you will be expending a lot of energy while hiking and you will need plenty of energy to keep you warm. you should pack foods high in to provide the most energy or kilocalories per gram of food.

The correct answer is fat.

Explanation:

Though, our body uses carbohydrates as the primary source of energy but fats provide more energy and heat as compared to the carbs.

Each gram of fat provides 9 Kcal of energy as compared to 4 Kcal of energy produced by carbs or proteins.

In addition, fats or lipids are long term energy reserves of the body. So, they are able to provide you energy during long duration of physical activity such as hiking.

Fats also help in making an insulating layer around the body which decreases the surface lost of heat and thus, help in keeping you warm.

after receiving a stimus, the sensory receptors send(s) signals to the appropriate area of the body.  

the must be sensory neurons.  

hope its .