by consuming plants or other animals
by consuming other plants and animals
Various animal wastes
they eat plants and animals
You get it every time you take a breath even though you don't need it to survive.
Proteins are a major interest to scientists who study the chemistry of living things. All living organisms contain protein. Plants make the proteins they need from substances on the air and soil. Humans and other animals must obtain the building material for proteins from the food that they eat.
Oxygen, carbon, hydrogen, calcium,
from food. Mainly by cleaving proteins and nucleic acids from food.
Animals obtain nitrogen by eating plants which have absorbed nitrogen from the soil.
The animals obtain nitrogen through their foods in various forms to build proteins they need for their bodies. Protein synthesis is a continuous process in the plant and animal cells from some 20 odd types of amino acids, thousands of types of proteins are synthesized by the ribosomes in each organism.
Nitrogen is consumed by different organisms in different ways. Legumes (a type of plant) are able to take nitrogen straight out of the atmosphere (which is roughly 78% nitrogen gas). Animals aren't able to do this so they must obtain their nitrogen by eating substances such as vegetables and meat. We break down proteins (largely from meat) down to their constituents which are amino acids. This is how we obtain our source of nitrogen (amino acids contain nitrogen atoms). We then use these amino acids to build proteins that we need in our body such as tissue, enzymes, antibodies and more.
If you are told it is a fact that animals do not need nitrogen, you can infer that you are receiving incorrect information. All living things require nitrogen. However, animals are not able to obtain the nitrogen they need directly, but must get it from their food, and that comes ultimately from the plants that are able to absorb nitrogen from the soil.
Plants cannot make protein from pure carbohydrate, because proteins contain nitrogen and sometimes sulphur. They get the nitrogen which they need from the nitrates in the soil.the bacteria called `Rhizobium `lives in the roots of legminous plants and leg. plants need nitrogen to grow pulses.The bacteria called `rhizobium` changes the atmospheric nitrogen in solution form and in return the plants give the bacteria shelter and food thus this is called a symbiotic relationship .
mostly from food.
Nitrogen
eating the plants
Nitrogen used by plants and animals is returned to the atmosphere by the action of bacteria. Bacteria break down proteins to obtain energy, releasing nitrogen back into the air in the process.
Nitrogen gas is fairly inert and so is difficult for organisms to process. Instead, animals must get usable nitrogen compounds from their food.
The only forms of nitrogen compounds that living things can make use of are ammonia compounds and nitrate compounds.These are called "fixed nitrogen". Animals obtain the nitrogen they need from proteins in the plants and/or animals they eat. Proteins are amino acid polymers and amino acids are built around an ammonia group.