outputs: carbohydrate, oxygen, heat, glucose

Omnivores are those animals, such as bears and humans, that can eat a variety of food sources, but tend to prefer one type to another.

While most carnivores, such as cats, eat only meat, facultative carnivores, such as dogs, behave more like omnivores as they can eat plant matter along with meat.

All energy for life on Earth comes from the sun. After the energy leaves the sun, it is used by plants on Earth where photosynthesis converts it to sugars. The plants store chemical energy that can be used by the plants, or converted into mechanical energy within an organism  Photosynthesis is the process that explains how energy from the sun is captured by green plants and used to make food. Most of this energy is used to carry on the plant's life activities. The rest of the energy is passed on as food to the next level of the food chain. 

macromolecules, which simply means large molecules formed by linking together small molecules. The major macromolecules within the cell include proteins, nucleic acids like DNA and RNA, carbohydrates, and lipids.