The drainage basin, the fundamental unit of the fluvial landscape, has been the focus of research aimed at understanding the geometric characteristics of the master channel and its tributary network." Discuss this statement with suitable figures and parameters.

Which of the following observation darwin shape his concept of descent with modification? a) species diversity declines farther from the equator. b) fewer species live on islands than on the nearest continents. c) birds live on islands located farther from the mainland than the bird's maximum nonstop flight distance. d) south american temperate plants are more similar to the tropical plants of south america than to the temperate plants of europe. e) earthquakes reshape life by causing mass extinctions.