The cause of mimicry is:

Which one of the following scientists is not related to organic evolution?

Which of the following statements is false for $Tyrannosaurus$ $rex$?

Assertion: From an evolutionary point of view,the human gestation period is believed to be shortening.
Reason: One major evolutionary trend in humans has been the larger head undergoing a relatively faster growth rate in the foetal stage.

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.

The greatest evolutionary change enabling land vertebrates to be completely free from the water habitat was the development of: