AP BIOLOGY

Detailed explanation-1: -The chemical energy that organisms need comes from food. Food consists of organic molecules that store energy in their chemical bonds. In terms of obtaining food for energy, there are two types of organisms: autotrophs and heterotrophs.

Detailed explanation-2: -Thus, organisms fulfill their energy demands by consuming food.

Detailed explanation-3: -Food is the source of energy for all living organisms. Some organisms can make their own food. They are called autotrophs or producers. Other organisms cannot make their own food and obtain their food from autotrophs.

Detailed explanation-4: -ATP, or adenosine triphosphate, is chemical energy the cell can use. It is the molecule that provides energy for your cells to perform work, such as moving your muscles as you walk down the street.

Detailed explanation-5: -The living organisms use chemical energy for carrying out various life processes. They get this chemical energy from food through chemical reactions like respiration.