Which of the following uses $RNA$ as a template strand for $DNA$ synthesis?

The richest sources of vitamin $B_{12}$ are

Observe the following reaction: $2 A + B \longrightarrow C$. The rate of formation of $C$ is $2.2 \times 10^{-3} \ mol \ L^{-1} \ min^{-1}$. What is the value of $-\frac{d[A]}{dt}$ (in $mol \ L^{-1} \ min^{-1}$)?

The incorrect stability order of $+3$ and $+1$ states of $13^{th}$ group elements (boron family) is

The equivalent weight of phosphoric acid $(H_3PO_4)$ in the reaction,$NaOH + H_3PO_4 \to NaH_2PO_4 + H_2O$ is

Where is the compound squamous epithelium found?