Which of the following arrangements of periods of the Mesozoic era gives a correct sequence from the earliest to the latest?

Which two geographical regions are separated by high mountains?

Scientists believe that evolution is gradual. However,extinction,which is a part of the evolutionary story,is often 'sudden' and 'abrupt' and also group-specific. Comment on whether a natural disaster can be the cause of the extinction of species.

The $Jurassic$ period of the $Mesozoic$ era is characterized by:

Given below are four statements $(A-D)$ each with one or two blanks. Select the option which correctly fills up the blanks in two statements.
Statements:
$(A)$ Wings of butterfly and birds look alike and are the results of $ . . . . . . (i) . . . . . . $ evolution.
$(B)$ Miller showed that $CH_4, H_2, NH_3$ and $ . . . . . . (i) . . . . . . $ when exposed to electric discharge in a flask resulted in formation of $ . . . . . . (ii) . . . . . . $.
$(C)$ Vermiform appendix is a $ . . . . . . (i) . . . . . . $ organ and an $ . . . . . . (ii) . . . . . . $ evidence of evolution.
$(D)$ According to Darwin,evolution took place due to $ . . . . . . (i) . . . . . . $ and $ . . . . . . (ii) . . . . . . $ of the fittest.

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.