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<span>Reaction time<span>, which can either be
simple or complex refers to the time
needed for perception and evaluation of a stimulus and the time necessitating a response. A </span></span><span>complex reaction time
involves selecting a specific and correct response from several choices when
presented with several different stimuli.</span>
Nitrogen is very crucial for life because it is one of the important ingredient that is needed for plants to grow. Human and animals who eat plants materials obtain nitrogen from the plant. Nitrogen is needed in the humans and animals bodies for formation of proteins and nucleic acid which are very essential for life. When animals and humans die the nitrogen in their bodies return to the earth again and is used by plants.
