Asubstance produced by some insects that was used to make records before world war ii

Which substance has non polar covalent bonds

Ascientist conducted an experiment and discovered that certain plants grow faster when given a particular amount of fertilizer. anouther scientist conducted the same experiment and got similar results. which concept does this best illustrate? a) repetition b) replication c) precision d) validity

What are the coefficients that will balance the skeleton equation below? n2 + h2 → nh3