Nitrogen is required by plants and animals for protein synthesis
Plants, animals and organisms need nitrogen to create protein synthesis
some leguminous plants like peas have legumes in there roots. legumes are small swellings, which contains nitrogen fixing bacteria. they helps in nitrogen fixation. other plants like paddy can use these nitrogen for there growth.
Nitrogen is an absolutely essential part of amino acid structure, which makes up protein. Organisms are essentially "made" of protein, that is, the structure and function of their bodies is thanks to proteins. Nitrogen also has many other uses in the body such as the synthesis of non-protein nitrogen products (Nitric oxide, a vasodilator, and GABA, a neurotransmitter just to name a few.) But protein is definitely the most important function of Nitrogen. (Thanks to Jen for this answer!)
prey also called carnivores. if the animal also eats plants, it's called an omnivore.----------------------------------------------------------------------------------------just leave it at 'prey' that is the simplest answerpredetors
Herbivores obtain nitrogen just like any other animal - through the air, which is mostly composed of nitrogen. However, organic nitrogen that can be used in proteins is only found in autotrophs. Through the nitrogen cycle, atmospheric nitrogen is fixed as organic nitrogen which is assimilated by plants. Herbivores, like omnivores and carnivores, get their nitrogen from food. The trick is getting the nitrogen "fixed" into the food in the first place. About 80% of earth's atmosphere is nitrogen, but atmospheric nitrogen is very nearly inert (the triple bond between the nitrogen atoms is difficult to break). It does not readily engage in chemical reactions, so plants and animals cannot get their nitrogen by breathing. Oxygen, on the other hand, reacts easily, so you'll find that you can get the oxygen you need directly from the atmosphere. Plants extract carbon directly from the atmosphere--from carbon dioxide and photosynthesis. That carbon, plus water and some other ingredients, produce the carbohydrates and other nutrients we get from plants. But like us, plants can't capture atmospheric nitrogen. They have to get the nitrogen they need for proteins & DNA from another source. So how does nitrogen get fixed into plants? Primarily via nitrogen compounds in the soil. There is a bit of nitrogen in any soil, thanks to decaying plants & animals and the activity of certain types of bacteria. But if you farm the soil intensively, you can quickly exhaust the naturally occurring nitrogen. One way to build up the nitrogen in soil is to exploit a symbiotic relationship between certain types of bacteria and a few types of plants. Bacteria that grow on the roots of some bean plants convert atmospheric nitrogen into compounds that stay in the soil. This is the phenomenon behind crop rotation with soy beans--you let the bacteria on the soy bean's root replenish the nitrogen in the soil. Then crops you grow in that soil pass that nitrogen through the food chain. For example, an herbivore might eat the crop directly, or a carnivore could eat the flesh of an herbivore that ate the crop that grew in the field that once grew soy beans that hosted nitrogen-fixing bacteria. Another way to get the nitrogen into the soil is via animal waste. Manure contains a good deal of fixed nitrogen. Hence the smell that bothers city folk when they visit farm country. Today, a good deal of the nitrogen in crops comes from manufactured fertilizer. The Haber-Bosch chemical process, developed about a hundred years ago, draws nitrogen from the air and fixes it in forms that can be used for fertilizer (or explosives.) About half of the nitrogen in your body came from the atmosphere via the Haber-Bosch process. (See "The Alchemy of Air" by Thomas Hager, 2008, for more on the history of Haber-Bosch.) Without Haber-Bosch, a couple billion of us humans would not be alive.
An animal that can eat both meat and veg is called an omnivore. Humans are regarded as omnivores as well as other living organisms such as pigs and crows.
Plants and animals die and decomposers break down their nitrogen containing molecules to ammonia. All animals get the nitrogen they need by eating plants, by eating other animals that ate plants, or by eating animals that ate animals that ate plants.
Since the air around you is about 78% nitrogen gas, you might think it would be easy for organisms to retrieve nitrogen easily. However, most organisms cannot use nitrogen gas. Nitrogen gas is called "free" nitrogen because it's not combined with other atoms. Most organisms can use nitrogen only when it has been combined with other elements to form nitrogen-containing compounds. So, is that the answer you were looking for (possibly for homework)?
By lightening and by nitrogen fixing bacteria in the roots of certain plants (eg the legumes).
Industrial fixation is a synthetic method of converting atmospheric nitrogen to nitrogen oxides or ammonium ions that plants and other organisms are able to use
Humans (and most, and if, not all other organisms) need nitrogen is to produce protein. Oxygen is used up in respiration to help produce energy used by the human (and other organisms, but not plants) body.
Nitrogen is found in all living systems as part of the makeup of biological compounds. Animals obtain the nitrogen they need by eating plants, or by eating other animals that have eaten plants.
Well, you just said it - plants and animals. Plants are plant organisms and animals are animal organisms. Other organisms are fungus, micro-organisms, and more. All organisms are place into three groups - producers, consumers, and decomposers.
Animals are organisms that eat other animals or plants to gain energy.
The atmospheric nitrogen. This is a diatomic and triple bonded form of nitrogen that can not be metabolized by organisms other than some bacteria which convert it into usable form for plants.
Certain plants like clover, soybeans, alfalfa, lupines, peanuts, and rooibos can perform nitrogen fixation.
Nitrogen-fixing bacteria
Lightning is helpful to organisms because it provides nitrogen, which plants need a little to live. Other organisms, such as animals, not so good for because it good die if it is un-sheltered.