Organisms that synthesize their own nutrients they need for life, called autotrophic.This type of power is also called "autotrophic".According to living organisms for the existence of sufficient protection to the presence of carbon dioxide, water, inorganic salts and a specific energy source.The purple bacteria and green plants are fed by means of photosynthesis.In some bacteria exist type of food in which they are useful compounds prepared by the oxidation of various inorganic substances such as hydrogen sulfide and ammonia.The energy source is usually the sunlight.
Creatures that use heterotrophic nutrition, are unable to synthesize the material they need on their own.They are forced to use the existing connection.Therefore heterotrophic type of food is carried out by autotrophs or the remains of other organisms.Thus formed food chain.For creatures that use this type of food, most of those bacteria, fungi, and all animals.
There are different types of heterotrophs.Some creatures can eat other or their parts, and then digest.It holozoic type of food.These are constantly being hunted to feed themselves.Cats eat mice and birds, frogs eat mosquitoes and flies, owls eat rodents, etc.Organisms that have this type of power, endowed with certain senses, muscular and nervous tools.This arsenal helps them find and catch prey.The conversion of food into molecular compounds that the organism can assimilate, occurs in the digestive system.
Some plants (sundew, Venus flytrap), except for photosynthesis can still get food by hunting.They catch, lure and digesting various insects, as well as some small animals.Such plants are called "carnivorous".
Herbivores feed on plant food and get out of her cell energetically valuable connections that are synthesized by green plants.
holozoic Another group of animals (carnivorous predators) uses a type of food when they eat herbivores or other carnivores.Some of them are omnivores and can eat both plant and animal food.
Initially, all heterotrophic creatures get energetically valuable substances from autotrophs.Green plants synthesize these compounds by means of photosynthesis.Sunlight is the main source of energy.Without it, there were no life on the planet, since it is the basis of all the nutrients.
Most species of bacteria, yeasts and molds are not able to swallow food whole.They are fed through the cell membrane.This type of power is called heterotrophic saprophytic.These creatures can live only in places where there are vegetable or animal organisms that decompose, or a significant amount of their metabolic products.
