From which ancestral groups did birds and mammals evolve?

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

Select the mismatched pair.

In recent years,$DNA$ sequences (nucleotide sequence) of $mt-DNA$ and $Y$-chromosomes were considered for the study of human evolution,because

Which of the following statements is correct regarding the history of life on Earth?