Darwinian theory was unable to explain:

........ is the largest land reptile.

What type of evolution is shown in the figure?

Choose the correct statement from the following:
$A$. Charles Darwin travelled around the world in a ship called $HMS$ Beagle
$B$. There has been gradual evolution of life forms
$C$. According to Darwin,fitness refers to physical fitness only
$D$. Fossils are remains of hard parts of life forms found in rocks
$E$. Hugo De Vries,a naturalist worked in Malay Archipelago.

Identify the correct statement from the given options.

Closely related,morphologically similar sympatric populations,but reproductively isolated,are designated as