What is the frozen soil of the tundra called ?

Which of the following is not a main characteristic that scientists focus on when determining which kingdom an organism belongs to

(! ) what’s fracking and what does it have to do with carbon, carbon dioxide, or fossil fuels?

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.