Kingdom of animals on Earth

Animals are multicellular organisms. All of them must ingest other organisms or their products for the food. Thus belong to the group of heterotrophs. The same process takes place with humans. Humans mostly eat meat and it consists of muscle fibers with a certain fat, content of the connective tissue and organs. It is rich in proteins, fats, vitamins and other values. Products from them include milk produced by the mammary glands and processed dairy products such as cheese and butter. Birds and other animals lay eggs, which are eaten. Bees produce honey, obtained from the nectar of flowers.

Most of them indirectly used the sun’s energy by eating plants or eat animals that eat plants. Plants use light to convert inorganic molecules to proteins, carbohydrates, fats and other biomolecules. They containing reduced carbon in the form of carbon-hydrogen bonds. Water and carbon dioxide in photosynthesis converts solar energy into chemical energy in the form of simple sugars such as glucose, with separation of molecular oxygen. These sugars are used as a material for the production of plant growth and other biomolecules.

When animals eat plants or animals that eat plants, reduced carbon in the food becomes a source of energy for them. This helps to grow and release stored solar energy and thus give the animal the energy required to move. Some of them that live near hot water or cold hole in the bottom of the ocean, rich in methane, sulfur and hydrogen and rich liquid hydrocarbons, not dependent on the energy of the sun but chemosynthesis and bacteria make up the base of the food chain.

The types of animals that people eat are pig, cow, sheep, rabbit and other.
 

They are mostly farmed animals and people deal with hunting from ancient times, so that their diet includes wild animals (bear, deer, boar, snake and other). Food includes the type of birds such as chickens or pheasants.