5. Animal waste decay by the action of bacteria which create ammoniaand nitrateproducts rich in nitrogen, and useful for plants to use again. 6. Denitrifying bacteria in the soil can break down the ammonia into the gaseous form of nitrogen, which is not available for use by plants or animals.
This statement means that the flow of nutrients is not unidirectional in an ecosystem, i.e. the nutrients do not flow in one direction. ... Example: Nutrients that are passed on from the plants to herbivores and then to other organisms are recycled back into the atmosphere after that organism.
Isotonic contractions maintain constant tension in the muscle as the muscle changes length. This can occur only when a muscle's maximal force of contraction exceeds the total load on the muscle. Isotonic muscle contractions can be either concentric (muscle shortens) or eccentric (muscle lengthens).
