I hate these things, it might just be me but I never understand how to answer these, for some reason. A little help? :)

Describe the primary and secondary immune response in terms of speed and number of antibodies produced?

Which sequence correctly shows the path of carbon dioxide during repiration?

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.