According to Darwin, random changes that enhance a species’ ability for surviving are naturally selected and passed on to succeeding generations. A. a species’ B. for surviving C. are D. to succeeding

A．the features of volcanic activities
B．the importance of the theory about drifting plate
C．the significance of hot spots in geophysical studies
D．the process of the formation of volcanoes

A．the structure of the African plates
B．the revival of dead volcanoes
C．the mobility of the continents
D．the formation of new oceans