Nitrogen cycles between the biotic and abiotic factors in a ecosystem which of the following organisms is primarily reponsible for changing nitrogen into a usable form

Facilitates growth and change in neurons and the migration of neurons to different sites in the brain

What causes darkening of the skin as melanin production increases

Asolution of an enzyme and a substrate was placed in a water bath and the temperature of the reaction was raised gradually. the graph shown was plotted at the end of the experiment. what can be concluded from the graph? a) temperature has no effect on the activity of the enzyme. b) the effect of temperature on the enzyme is unpredictable. c) the enzyme shows increased activity up to a certain temperature. d) the activity of the enzyme is inversely proportional to the temperature.