Clones do not appear during

Why planets do not appear twinkling?

Which of the following is correct for mRNA synthesized in leucocytes? (a) Exons and introns do not appear in the mature RNA. (b) Exons appear but introns do not appear in the mature RNA. (c) Introns appear but exons do not appear in the mature RNA. (d) mRNA is not synthesized in leucocytes.

Bivalents first appear during

Bivalents first appear during

The first seed plants appeared during

The first seed plant appeared during

The first seed plants appeared during

The first seed plants appeared during

The first seed plants appeared during

The first modem birds appeared during the :-