What is the natural source of salicylic acid?

Calculate the number of unit cells in $1 \mathrm{~cm}^3$ of an element if unit cell edge length is $2.0 \times 10^{-8} \mathrm{~cm}$.

Identify the carbon atom numbered from $\mathrm{C}_1^{\prime}$ to $\mathrm{C}_5$ of monosaccharide unit of DNA nucleotide that lacks oxygen atom from -OH group.

What is the oxidation number of carbon in methanal?