Explain the role of the following scientists in the discovery of $DNA$:
$1.$ Friedrich Miescher $(1869)$
$2.$ Maurice Wilkins and Rosalind Franklin

(N/A) $1.$ Friedrich Miescher identified $DNA$ as an acidic substance present in the nucleus in $1869$. He named it 'Nuclein'.
$2.$ Maurice Wilkins and Rosalind Franklin produced the $X$-ray diffraction data for $DNA$, which was crucial for understanding its structure.