Riddle
there are five coloured liquid chemicals. you need to obey the instructions to produce poison.
instructions:
yellow isn't last.
green isn't first.
red isn't in the middle.
black is between yellow and green.
and blue comes before red and after green.

Venom, snakes? if that’s what your asking?

Okay, biology isn't exactly my strongest subject (it never has been), but i'm pretty sure the answer is nucleotides. dna is made up of nucleotides. each nucleotide contains a phosphate group, a sugar group, and a nitrogen base. there are four different nitrogen bases: adenine (a), thymine (t), guanine (g), and cytosine (c). a always pairs with t, and g always pairs with c.