What does the term "limiting nutrient" mean when
referring to nitrogen?

A. Nitrogen does not control the rate
productivity in an ecosystem.

B. Nitrogen controls the rate of
productivity within an ecosystem.

C. Nitrogen is limited, so it is reserved
especially for bacteria.

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.