In which of the following ways are the concepts of gradualism and punctuated equilibrium in evolution similar?
a. both find long periods of relative stability within each species in the fossil record.
b. both state that evolution has been going on throughout earth's history.
c. both explain that evolution happens continuously as small genetic variations accumulate.
d. both require extinction of one species before another species can arise.

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.

Which direction does the energy flow in this energy pyramid ?

How and why organisms are hierarchically classifies