fat molecules typically contain long chains of carbon atoms. animals tend to store fats for use when food resources are scarce. this is an advantage to the animal because..
1) much energy can be gained by breaking the bonds between atoms in the fats
2) fats give off carbon dioxide that can be used by the muscles
3) amino acids from fat synthesis are more easily digested than carbohydrates
4) energy can only be created by digesting fats

The correct answer is 1 much energy  can be gained by breaking the bonds between atoms in the fats.

Explanation:

Fat molecules are stored as triacylglycerol in the adipose tissue of our body.When there is a scarce of food resource in our body at that time the stored fat is utilized by the body to generate energy by the breakdown of stored fat.

      Triacylglycerol is broken down by the enzyme lipase into glycerol and fatty acid. The so formed fatty acid then enters into β oxidation to generate energy to meet the energy demand of our body.

1) much energy can be gained by breaking the bonds between atoms in the fats

Explanation:

Fats are the slowest but most efficient source of energy. For this reason, they are the ideal molecule to be used by animals in times of food shortages. Much energy can be gained by breaking the bonds between atoms in the fats

Each gram of fat provides about 9 calories to the body, more than double the amount of protein or carbohydrate. The body takes advantage of this effectiveness to store any excess energy in the form of fat. The body stores excess fat in the abdomen (omental fat) and under the skin (subcutaneous fat) for use when it needs more energy.

the correct answer is:

a population changes in response to a change in the environment.