An evolutionary trend in which there is general degeneration and loss of organs is known as:

$A$: Mesozoic is the era of dinosaurs,but they suddenly disappeared from the earth.
$R$: Dinosaurs may have changed into birds or climatic changes killed them.

Assertion: Leaf butterfly and stick insect show mimicry to dodge their enemies.
Reason: Mimicry is a method to acquire body colour blending with the surroundings.

Which one of the following is not a true fossil?

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.

Which of the following sequences of animals is correct with respect to the evolution of the ear?