Pelycosaurs and Therapsids were

What is common between whales,seals,and sharks?

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

Match the factors of modern synthetic theory/speciation in Column $I$ with the examples in Column $II$ and select the correct option.

Column $I$	Column $II$
$A$. Natural selection	$I$. Darwin's finches
$B$. Geographical isolation	$II$. Mule
$C$. Hybrid sterility	$III$. Cichlid fishes in Lake Victoria
$D$. Sympatric speciation	$IV$. Biston carbonaria

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.

The pioneers in the field of 'organic evolution' are