refer(s) to specific molecular changes that occur when a drug binds to a particular target site or receptor, while are the resulting widespread alterations in function. v

Drug action; drug effects

Explanation:

Drug action can be defined as the combination of the drug with the specific site of the receptor and brings about specific changes at the molecular level of the organism.

The drug effect can be defined as the physiological and biochemical changes that occur at the consequence of action of drug. The effects of the drugs on the body can be observed in the symptoms.

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the nitrogen cycle provides nitrogen to the ecosystem from the atmosphere, ground and oceans. nitrogen is an important component of complex molecules such as amino acids and nucleotides, which lead to the creation of proteins and dna, the building blocks of all life. plants absorb nitrogen in the form of ammonium, nitrate ion and, on rare occasions, as amino acids. animals receive nitrogen necessary for biological processes from feeding on living or dead organic matter.