Which of the following statements are correct about impact of Darwin on Geographical thought?

A. James Hutton demonstrated the theory of uniformitarianism in landform evolution.

B. Fleure used struggle and selection concept in his studies on races, states and towns.

C. Darwin's work on the origin of atolls and the idea regarding slow transformation of biological species over time, together inspired Davis to develop his own theory of the cycle of erosion.

D. Stoddart stressed the need for physiological study to assess environmental effects on man.

Choose the correct answer from the options given below: